(Ans). (B)
(Question). There are 24 distinct numbers in set M, there are 28 distinct numbers in set N, and there are 12 distinct numbers that are in both sets M and N. Set H is the set containing the elements that are in at least one of sets M and N. How many elements are in set H?
Options:
(A) 39
(B) 40
(C) 51
(D) 58
(E) 63
(CoT). {Total} = {M} + {N} - {Both}
{Total} = 24 + 28 - 12 = 40.

(Ans). (C)
(Question). If six persons sit in a row, then the probability that three particular persons are always together is
Options:
(A) 1/20
(B) 3/10
(C) 1/5
(D) 4/5
(E) 2/5
(CoT). Six persons can be arranged in a row in 6! ways. Treat the three persons to sit together as one unit then there four persons and they can be arranged in 4! ways. Again three persons can be arranged among them selves in 3! ways. Favourable outcomes = 3!4! Required probability = 3!4!/6! = 1/5

(Ans). (A)
(Question). A person spends 40% of his salary on food, 25% on house rent, 15% on entertainment and 10% on conveyance. If his savings at the end of the month is Rs. 1200, then his salary per month in rupees is:
Options:
(A) 12000
(B) 6000
(C) 8000
(D) 10000
(E) None of these
(CoT). Total expenditure = 40 + 25 + 15 + 10 = 90%
Saving = (100 - 90) = 10%
10/100 Salary = 1200, Salary = 12000 Rs.

(Ans). (A)
(Question).
In what time will a railway train 50 m long moving at the rate of 36 kmph pass a telegraph post on its way?
Options:
(A) 5 sec
(B) 4 sec
(C) 3 sec
(D) 6 sec
(E) 1 sec
(CoT). T = 50/36 * 18/5 = 5 sec