gmat quant

Question 1

The product 3 consecutive Integers (n-1)n(n+1) can be devided by what number ?

Answer 1

6

Question 2

HCF(a,b)*LCM(a,b)=?

Answer 2

a*b

Question 3

The number of subsets of a set with n elements is given by ?

Answer 3

2^n

Question 4

The number of trailing zeros of n! can be determined by ?

Answer 4

n/5 + n/5^2 + n/5^3 … + n/5^k, avec k 5^k+1 >n

Question 5

A number is divisible by 2 if ?

Answer 5

The last digit is even or 0

Question 6

A number is divisible by 3 if ?

Answer 6

If the sum of the digits is divisible by 3

Question 7

A number is divisible by 4 if ?

Answer 7

If the last 2 digits are divisible by 4

Question 8

A number is divisible by 5 if ?

Answer 8

The last digit is 5 or 0

Question 9

Sum of squares of first n even numbers ?

Answer 9

[2n(n + 1)(2n + 1)] / 3

Question 10

Sum of squares of first n odd numbers ?

Answer 10

[n(2n+1)(2n-1)] / 3

Question 11

The sum of first n even integers is given by ?

Answer 11

x = n(n+1)

Question 12

The sum of first n odd integers is given by ?

Answer 12

y =n^2

Question 13

If a and b to consecutive number , a-b =?

Answer 13

1

Question 14

Odd+Even= ?

Answer 14

odd

Question 15

Even+even= ?

Answer 15

even

Question 16

odd+odd=?

Answer 16

even

Question 17

odd*even =?

Answer 17

even

Question 18

odd*odd=?

Answer 18

odd

Question 19

even*even= ?

Answer 19

even

Question 20

Consecutive even numbers cannot share any factor other than ?

Answer 20

2

Question 21

sum of n consecutive is =?

Answer 21

n*(n+1)/2

Question 22

Only what ? squares have an odd number of factors.

Answer 22

perfect

Question 23

Perfect square can have following as units digits ? and max how many zeros ?

Answer 23

1,4,9,6,5 and max one 0

Question 24

Every prime number greater than 3 can be expressed as either ?

Answer 24

6k + 1 or 6k - 1

Question 25

The total number of factors of N expressed in its prime factorization N= a^x1 * b^x2 * … *c^xk

Answer 25

(x1+1)(x2+1)… * (xk+1)

Question 26

Cyclicity of 2^n

Answer 26

2,4,6,8

Question 27

Cyclicité de 3^n

Answer 27

3,9,7,1

Question 28

Cyclicité de 4^n

Answer 28

4,6,4,6

Question 29

Cyclicité de 5^n

Answer 29

5,5,5,5

Question 30

Cyclicité de 6^n

Answer 30

6,6,6,6

Question 31

Cyclicité de 7^n

Answer 31

7,9,3,1

Question 32

Cyclicité de 8^n

Answer 32

8,4,2,6

Question 33

Cyclicité de 9^n

Answer 33

9,1,9,1

Question 34

Terminating decimals in a fraction are when the denominators is the product of something else than

Answer 34

2,5,10

Question 35

|x+y| <= ?

Answer 35

|x|+|y|

Question 37

a^m*a^n

Answer 37

a^m+n

Question 38

a^m/a^n

Answer 38

a^m/a^n

Question 39

All factorials greater that 5! will finish with a ?

Answer 39

0 because you will have 2*5.

Question 40

rate =

Answer 40

work/time

Question 41

Average speed= ?

Answer 41

total distance / total time

Question 42

profit = ?

Answer 42

(cell price-cost price)/cost price

Question 43

Combinations(when the order doesnt matter):

Answer 43

n!/(n-k)!k!

Question 44

digonal of as square is ?

Answer 44

rac(2)*x

Question 45

a line is directly proportional, y=?

Answer 45

y=k*x

Question 46

inversely proportional ,y=?

Answer 46

k*(1/x)

Question 47

x intercepts =>

Answer 47

y=0

Question 48

y intercepts =>

Answer 48

x=0

Question 49

volume d’un cylindre ?

Answer 49

π x rayon² x hauteur

Question 50

distance entre deux points : dist(A,B)= ?

Answer 50

√(x2−x1)^2+(y2−y1)^2

Question 51

formula of the midpoint is :

Answer 51

((xa+xb)/2; (ya+yb)/2))

Question 52

(x+e)(x+f)=?

Answer 52

x^2 +(e+f)x+ef