Question: Eight friends go to watch a movie but only 5 tickets were available. In how many different ways can 5 people sit and watch the movie?
Options:
(A) 8C5
(B) 8*7*6*5*4
(C) 5!
(D) 8!/5!
(E) 8*5
Answer: Choosing 5 out of 8, when order matters P58, or choosing 5 out of 8, without order and then arranging: C585!
The answer is (B).

Question: What is the sum of all the prime numbers greater than 30 but less than 50?
Options:
(A) 126
(B) 199
(C) 198
(D) 188
(E) 122
Answer: Required sum = (31 + 37 + 41 + 43 + 47) = 199
Note: 1 is not a prime number
The answer is (B).

Question: A can do a piece of work in 10 days. He works at it for 4 days and then B finishes it in 9 days. In how many days can A and B together finish the work?
Options:
(A) 6
(B) 8
(C) 12
(D) 15
(E) 20
Answer: 4/10+9/X = 1/x = 15
1/10+1/15 = 1/6 = 6 days
The answer is (A).

Question: Rs.800 amounts to Rs.920 in 3 years at simple interest. If the interest is increased by 3%, it would amount to how much?
Options:
(A) 288
(B) 200
(C) 279
(D) 992
(E) 208
Answer:
(800*3*3)/100 = 72
920 + 72 = 992
The answer is (D).