Data Sufficiency (4)

Question 1

Geometry figures are not nec. drawn to scale, therefore…

Answer 1

Never use a visual approx as your reason for saying a statement is sufficient. Always seek proof.

Question 2

Remember to consider what type of numbers?

Answer 2

Special case numbers (negatives, nonintegers, 0, numbers nearing infinity) - unless expressly ruled out (but I feel like this never happens)

Question 3

Algebraic Manipulation

Answer 3

Look to see if you can perform algebra to make a statement look like it does in the question, OR the question look like the statement

Question 4

Strategy - playing devil’s advocate

Answer 4

Statement seems sufficient, try to find edge cases (special case numbers).

Question 5

Strategy - leveraging assets

Answer 5

Labelling everything in a diagram, expressing each equation multiple ways via algebra, and questioning any piece of math infor you havent used

Question 6

Strategy - why are you here

Answer 6

When one statement is fairly obvious, there is usually a reason it is there. Hint to something you should have consided in other statement? Trap to avoid?

Question 7

When a question asks about a combination…

Answer 7

You can usually solve for the combo itself (3x-y) rather than both x and y. Look to do this.

Question 8

If an answer seemed to easy in DS…

Answer 8

Spend a bit extra time leveraging assets and/or playing devil’s advocate

Question 9

No Easy Es

Answer 9

Only pick E if you can prove it

Question 10

Characteristic of #2

Answer 10

Only even prime number