DM Flashcards
‘Nearly’ = slightly less than given figure
Tax threshold - Remember to subtract and find percentage
Not all = at least 1
Some = More than 1 but not all
‘or’ is not ‘and’
Count delays in timetable, person might not miss bus/taxi because of this
‘At least’ - Not always 100%
With probability, be aware if you pick individually or collectively (e.g 3/6 or 1/3 * 1/2)
‘Must’ may cause ‘eligibility’ to not follow, so ‘must be eligible’ may not follow
Number of intersects in venn diagram is equal to the number of ‘some’ statements
‘Identical funding sources’ (Basically means people in a company have the same amount of shares) - To find individual to 1/X where X is the total amount
If a box is 1/3 (or any other denominator), sum the entire of said box and divide by denominator value
Months of the year show seasonal changes (e.g weather, temperature etc.)
Majority = more than 50%
Few = Less than 50%
Eyeball for largest discount (https://app.medify.co.uk/m/ucat/practice/completed/2024-08-07:U:FjGB:LYe7/34378)
If you need to find the average percentage discount of two things, DO NOT find the average of both percentage discounts, instead do:
difference of both / total sum of both * 100
Not all: 1-99%
Make sure the reasoning of data in data syllogisms is concrete and not inferred
This also applies to narrative conclusions: do not make assumptions and only accept evidence which has been given in the text unless prompt has a probability factor (e.g might, may etc.)
When drawing narrative conclusions:
- Ideas are projected outside of the passage, so juist because it is true/false in the passage, it doesn’t mean that it is true in the question
- Definitions are key (e.g ‘some’, ‘many’ ‘all’)
‘Impossible’ is a turn off if it appears in the prompt
This is also true for other absolutes such as ‘always’ and ‘never’
Just because a person qualifies for two ‘and’ conditions, it does not mean that they will pass an ‘or’ condition
*not true according to GPT
For percentage profit, the value is 1.(percentage)
Understand the graphs they give; they may not necessaritly be linked together
In three circle venn diagrams, if told that X, Y and Z are 5 altogether put in centre.
If then told X and Y but NOT Z, then DO NOT minus centre value with given value
Cannot stress this enough, READ and UNDERSTAND the information given in narrative conclusions
SYLLOGISM LAW:
Logical assumptions are possible, although should be avoided UNLESS it seems like it is 100% plausible to the prompt
Gear reshift: Use the answer options in the question to find an answer (Keep in mind this is rare, but in the case where it isn’t, it is the only way to get the answer)
e.g (https://app.medify.co.uk/m/ucat/exams/completed/2024-08-15:U:FjGB:lPzG/47631)
If told that something triples (or any other multiplier) over the course of a time period (lets say year 2000 to 2020 is tripled) , it is actually 2x.
This is because in 2000, the value is 1x, and in 2020 it is 3x
3x - 1x = 2x
(This is absolute growth, as it represents the change in growth. Tripling would still end in 3x however.)
Keep this in mind in data/logical syllogisms
Data for individuals cannot be concluded from per capita
‘Net’ graphs do not simulate the entire scenario
For DM rotating points in a shape question:
1) Move the points at their given orientation as told in the prompt and multiply them together (e.f 4 clockwise, 3 anticlockwise = 4*3)
2) Take away this value with the number of vertices in the shape (e.g if the value is 8 because octagon do 12-8 = 4
3) The 8 is the number of COMPLETE revolutions and the 4 is the number of INCOMPLETE revolutions
4) So the 4 is the number of revolutions apart between the two points
Make sure you don’t miss some of the intersections while adding up combinations
There can be an extra person in syllogism that is not named
Look for the easiest comparison stem in the question
For assumptions, do not introduce any new variables into the arguement
Venn diagrams do not necessarily have to be in the three circle format
Be careful for ‘less than X hours’ and ‘took X hours’ trap
If given two percentages and you need to find an unknown total, you can use algebra and represent the total as X and the decimal percentages as (decimal percentage)X
Then use algebra to find the answer
To find the total percentage given two (or more) percentages for a population, find the average of said percentages
if pop is equal
Remember that 1 - (percentage of failure) is also an option
Write out the combinations of probabilities possible
Odd * odd = odd
odd * even = even
even * even = even
Percentage increase in lowered life expectancy is not equal to a percentage decrease in life expectancy
Resurgence - implies that the thing that is resurgent was once popular and not popular right now
Just because a venn diagram adds up to the total amount of pupils given in an option, it does not mean that it is true as it does not take into account the overlaps
To find the unknown value of an intersection of a venn diagram, you need to do :
Total membership - (membership - neither)
In salary raises, you SHOULD NOT multiply using 1.(decimal) as it does not represent the raise itself
Only do this if asked to calculate new salary
If given a half time/break question an need to find the lengths of each half, the break is included in the playing time so:
70 min playtime total
25 min break
then:
70 - 25 = 45min
45/2 = 22.5 minute halves
X per Y means X/Y
Rate = X / Time
Rate can stack as addition (e.g Rate + rate)
NOT multiplied
Make a ratio share the same number - do not be scared if it becomes a decimal
For probabilities which mention ‘at least’, do 1 - (probabilities of WHAT YOU DONT WANT)
so if you wanted at least one tails out of 3 coin flips, then you exclude HHH
Even chance = 50%
Some vs some questions:
if there is a some statement and the prompt asks if there is ‘some’ items left which is the opposite of the statement, then it must be false as the some statement could be 9/10, leaving 1/10 which is not ‘some’
In a deck of cards, there are 26 red, 26 black
Watch out for ‘at least’ statements in syllogisms as if all X like Y,
and asked if There are at least as many Y enjoyers as X
then true
If given a venn diagram which only gives value for neither and values which deny a value for each sides, then do value denied in circle - value outside
Make tables for venn diagrams with multiple links
Do not take values at face value, there may be traps
