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Using Pascal's identity, (\binom{6}{2}+\binom{6}{3}) is equal to which expression?पास्कल पहचान से (\binom{6}{2}+\binom{6}{3}) किसके बराबर है?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: (\binom{7}{4})(\binom{7}{4})
By Pascal's identity, (\binom{n}{r}+\binom{n}{r+1}=\binom{n+1}{r+1}). Hence the correct expression is (\binom{7}{3}).पास्कल पहचान से (\binom{n}{r}+\binom{n}{r+1}=\binom{n+1}{r+1}) होता है। इसलिए उत्तर (\binom{7}{3}) नहीं, सही (\binom{7}{3}) है।
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