Aptitude Tests 4 Me

Basic Numeracy/Quantitative Aptitude

68. Eight cardboard boxes are standing on the table. Two among them contain a present, the other six are empty. You are allowed to open two boxes. How much chance do you have to find at least one present?

 (a) 7/16 (b) 9/16 (c) 15/28 (d) 13/28

69. Peter, Mark, Anne and Rose are four good friends. They belong to a group of sixty pupils who are to be divided at random into three classes of twenty. What's the probability of all four friends sharing the same class?

 (a) 1/12 (b) 1/81 (c) 19x18x17/59x58x57 (d) 1/64

70. I have thirty socks in total disorder in my closet. Ten are black, ten are red and ten are brown, but I can't distinguish the colours in the dark. How many socks do I have to take to have at least one pair of the same colour?

 (a) 12 (b) 11 (c) 4 (d) 3

71. There are seven cups of tea. Two among them contain a deadly poison that acts within an hour. You and I both drink one cup simultaneously. How big is the chance that we both survive?

 (a) 10/21 (b) 25/49 (c) 11/21 (d) 24/49

72. If someone answers these ten multiple choice questions totally at random, what is the chance that he has all answers wrong?

 (a) 1/1,048,576 (b) 243/1,024 (c) 1/1,024 (d) 59,049/1,048,576

TOTAL

Detailed Solution

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