Rationale: P = (P*3*R)/100
R = 33 1/3%
The answer: (B)
Question: In what time a sum of money double itself at 3% per annum simple interest?
Options:
(A) 33 1/4%
(B) 33 1/3%
(C) 33 7/3%
(D) 33 5/3%
(E) 33 1/7%

Rationale: Number of ways of selecting 2 fiction books = 9C2
Number of ways of selecting 2 non fiction books = 6C2
9C2 * 6C2 = 36 * 15 = 540
The answer: (C)
Question: There are 9 fictions and 6 non-fictions. How many cases are there such that 2 fictions and 2 non-fictions are selected from them?
Options:
(A) 90
(B) 120
(C) 540
(D) 180
(E) 200

Rationale: Since the coin is a fair coin, every toss is independent of any other toss. Hence, the probability of appearance of tail on the fifth toss is = 1/2
The answer: (B)
Question: A fair coin is tossed repeatedly. If head appears on the first four tosses, then the probability of appearance of tail on the fifth toss is.
Options:
(A) 1/7
(B) 1/2
(C) 3/7
(D) 2/3
(E) 1/3