nCr + nC(r-1) এর সঠিক মান কোনটি?

A nC(r+1)

B (n+1)Cr

C (n+1)C(r+1)

D (n+1)C(r-1)

Solution

Correct Answer: Option B

ব্যাখ্যাঃ  nC + nCr-1 = n+1C    [অনুসিদ্ধান্ত]  

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