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Triplet (x, y, z) is chosen from the set {1, 2, 3,, …., n}, such that xy<z .The number of such triplets is

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By Expert Faculty of Sri Chaitanya
a
n3
b
n+1C3
c
nC2
d
nC2+nC3
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detailed solution

Correct option is B

Number of selections when x

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