Number System
The product of two consecutive odd numbers is 4095 What is the greater number ?

61
65
69
74

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Number System
On a new year eve, every student of a class sends a card to every other student. If the total number of cards delivered is 1980, how many students are there in the class ?

43
47
41
45

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Number System
A basket contains eight white and ten black balls. Two draws of one ball each are made without replacement. What is the probability that one ball is white and the other ball is black ?

80/150
80/153
80/152
80/151

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