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If ( \binom{11}{r}=\binom{11}{r-3} ), what is the value of ( r )?यदि ( \binom{11}{r}=\binom{11}{r-3} ), तो ( r ) का मान क्या है?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: (7)(7)
By symmetry, (r+(r-3)=11), so (r=7). In ( \binom{n}{a}=\binom{n}{b} ), often (a+b=n) is useful.सममिति से (r+(r-3)=11), इसलिए (r=7) है। ( \binom{n}{a}=\binom{n}{b} ) में अक्सर (a+b=n) काम आता है।
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