Answer each of the following questions in one word or one sentence or as per exact requirement o...

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Answer each of the following questions in one word or one sentence or as per exact requirement of the question:
If \( a \) and \( b \) denote respectively the coefficients of \( x^{m} \) and \( x^{n} \) in the expansion of \( (1+x)^{m+n} \), then write the relation between \( a \) and \( b \).
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