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Question

The value of 15C0+ 15C1+ 15C2++ 15C7 is

A
214
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B
215
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C
213
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D
27
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Solution

The correct option is A 214
Let S= 15C0+ 15C1+ 15C2++ 15C7
We know that,
15C0+ 15C1+ 15C2++ 15C15=215S+ 15C8++ 15C15=2152S=215 ( 15Cr= 15C15r)S=214

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