When ten persons shake hands with one another, in how many ways is it possible?
- (a)20
- (b)25
- (c)40
- (d)45
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Official answer(d) 45
Other questions on Quantitative Aptitude
In a tournament 14 teams play league matches. If each team plays against every other team once only then how many matches are played?
- (a)105
- (b)91
- (c)85
- (d)78
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Official answer(b) 91
A question paper had ten questions. Each question could only be answered as True (T) or False (F). Each candidate answered all the questions. Yet, no two candidates wrote the answers in an identical sequence. How many different sequences of answers are possible?
- (a)20
- (b)40
- (c)512
- (d)1024
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Official answer(d) 1024
Running at a speed of 60 km per hour, a train passed through a 1.5 km long tunnel in two minutes. What is the length of the train?
- (a)250 m
- (b)500 m
- (c)1000 m
- (d)1500 m
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Official answer(b) 500 m
A person X has four notes of Rupee 1, 2, 5 and 10 denomination. The number of different sums of money she can form from them is
- (a)16
- (b)15
- (c)12
- (d)8
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Official answer(b) 15
Two numbers X and Y are respectively 20% and 28% less than a third number Z. By what percentage is the number Y less than the number X?
- (a)8%
- (b)9%
- (c)10%
- (d)12%
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Official answer(c) 10%
A person travelled a distance of 50 km in 8 hours. He covered a part of the distance on foot at the rate of 4 km per hour and a part on a bicycle at the rate of 10 km per hour. How much distance did he travel on foot ?
- (a)10 km
- (b)20 km
- (c)30 km
- (d)40 km
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Official answer(b) 20 km