q: Find the wrong number below mentioned series
11,150,280,560,800
Options:
(A) 800
(B) 560
(C) 280
(D) 150
(E) 11
a: Stream of consciousness: 11 is the only prime number or odd number in the series. The answer is (E).

question: Right triangle ABC is the base of the prism in the figure above. If AB=AC=2 and the height of the prism is 3, what is the volume of the prism?
Options:
(A) 1
(B) 3/2
(C) 2
(D) 3
(E) 6
answer: Stream of consciousness: Volume of prism = Area of base * height = 1/2* (square root of 2) * (square root of 2)*3 = 3 The answer is (D).

q: From among the 38 students in a class, one leader and one class representative are to be appointed. In how many ways can this be done?
Options:
(A) 1360
(B) 1260
(C) 1060
(D) 1160
(E) 1406
a: Stream of consciousness: There are 38 students and every one has equal chance of being selected as a leader. Hence, the leader can be appointed in 38 ways. When one person is appointed as leader, we are left with 35 students. Out of these 37 teachers, we can select one class representative. So, a class representative can be selected in 37 ways. Hence, the number of ways in which a leader and class representative can be selected = 38 x 37 = 1406 The answer is (E).

question: Two trains are moving at 50 kmph and 70 kmph in opposite directions. Their lengths are 170 m and 100 m respectively. The time they will take to pass each other completely is?
Options:
(A) 3 sec
(B) 8 sec
(C) 9 sec
(D) 5 sec
(E) 7 sec
answer: Stream of consciousness: 70 + 50 = 120 * 5/18 = 100/3 mps
D = 170 + 100 = 270 m
T = 270 * 3/100 = 8 sec The answer is (B).

q: If north becomes south-west ant south-west becomes east and all the directions changed in the same manner,then what will be the direction for south-east?
Options:
(A) North-West
(B) North-East
(C) North
(D) West
(E) none
a: Stream of consciousness: North -> South-west
North-east -> West
East -> North-west
South-east -> North
South -> North-east
South-west -> east
West -> South-east
North-west -> south The answer is (C).

q: Find the odd man out 3, 5, 7, 12, 13, 17, 19
Options:
(A) 3
(B) 5
(C) 7
(D) 12
(E) 13
a:
Stream of consciousness: 12 is an even number while the others are od The answer is (D).