Fifteen telegenic contestants with a variety of personality disorders are to be divided into two "tribes" of four members each, tribe A and tribe B, for a competition. How many distinct groupings of two tribes are possible?
Options:
(A) 120
(B) 126
(C) 252
(D) 1200
(E) 1365

My ans is 15C4 = 1365 So the answer is: (E).

The average of first four prime numbers greater than 30 is?
Options:
(A) 38
(B) 20
(C) 30
(D) 40
(E) 50

31 + 37 + 41 + 43 = 152/4 = 38 So the answer is: (A).

Calculate the value of n from the below equation: n^310n+20=44
Options:
(A) 1
(B) 5
(C) 3
(D) 2
(E) 4

Use elimination method to find the correct option. you find that of all the options when 4 is the correct value for n So the answer is: (E).

A 70 cm long wire is to be cut into two pieces so that one piece will be 2/5th of the other, how many centimeters will the shorter piece be?
Options:
(A) 10
(B) 20
(C) 30
(D) 40
(E) 50
1: 2/5 = 5: 2
2/7 * 70 = 20 So the answer is: (B).