Questions
Suppose is a set containing n distinct elements. Let and at least two of are equal }.
The number of elements in is
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a
n(3n−2)
b
n2(n−2)
c
n3-nC3
d
n(5n−4)
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Correct option is A
We can choose x,y,z in n3 way out of which nP3 have distinct elements.Similar Questions
The number of ways in which we can get at least 6 successive tails when a coin is tossed 10 times in a row, is
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