JEE Advanced Mathematics question
The total number of selections of at most things from different things is 63. Then the value of is
Answer: (A)
Solution
Selections of at least one and at most things:
63={}^{2n+1}+{}^{2n+1}++{}^{2n+1} ⇒ 64={}^{2n+1}+{}^{2n+1}++{}^{2n+1}.
Since C_r$=
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