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HCU MCA 2013 Paper

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Question : 6

Total: 75

There are 10 positive real numbers n1<n2<n3<...<n10. How many triplets of these numbers( n1,n2,n3), ( n2,n3,n4 ), ... can be generated, such that in each triplet the first number is always less than the second number and the second number is always less than the third number?

45
90
120
180

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