q: The no. of girls in a class are seven times the no. of boys, which value cannever be the of total students?
Options:
(A) 2
(B) 5
(C) 8
(D) 9
(E) 10
a: Let the boys are X, then girls are 7X, total = X+7X = 8X
So it should be multiple of 8, 30 is not a multiple of 8. The answer is (C).
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q: Using all the letters of the word "THURSDAY", how many different words can be formed?
Options:
(A) 8
(B) 8!
(C) 7!
(D) 7
(E) 5
a: Total number of letters = 8
Using these letters the number of 8 letters words formed is ⁸P₈ = 8!. The answer is (B).
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q: The compound ratio of 2/3, 6/7, 1/5 and 1/8 is given by?
Options:
(A) 7/98
(B) 1/48
(C) 1/98
(D) 3/350
(E) 1/68
a: 2/3 * 6/7 * 1/5 * 1/8 = 12/1400 = 3/350 The answer is (D).
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q: A shipment of 8 TV sets contains 5 black and white sets and 3 color sets. If 2 TV sets are to be chosen at random from this shipment, what is the probability that at least 1 of the 2 sets chosen will be a black and white set?
Options:
(A) 1/7
(B) 1/4
(C) 5/14
(D) 25/28
(E) 13/28
a:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
3/8 * 2/7 = 6/56
1-(6/56) = 50/56 = 25/28 The answer is (D).
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