q: A money lender lends Rs.2000 for six months at 20% p.a. rate. It the interest is reckoned quarterly than find the amount given after time limit?
Options:
(A) 2205
(B) 8786
(C) 8275
(D) 2872
(E) 2282
a: OK... A = 2000(21/20)2 = 2205
The answer is (A).

q: A box contains nine bulbs out of which 4 are defective. If four bulbs are chosen at random, find the probability that atleast one bulb is good.
Options:
(A) 125/127
(B) 127/125
(C) 125/126
(D) 126/125
(E) 126/127
a: OK... Required probability = 1 - 1/126 = 125/126
The answer is (C).

q: In how many different ways can the letters of the word 'PREPTY' be arranged?
Options:
(A) 120
(B) 230
(C) 330
(D) 340
(E) 360
a:
OK... Number of ways = 61/21 6X5X4X3X2X1 - 360
The answer is (E).