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)
Correct Answer: Option B
ব্যাখ্যাঃ nCr + nCr-1 = n+1Cr [অনুসিদ্ধান্ত]
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