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permutaions n combinations
where to apply coefficient of (x1+x2+x3+......) and how
Dear siva,
we use multimonial theorom in permutation and combination in two cases
1) when we have to find number of ways of dividing n identical items among r persons then we will find the coefficient
of xr in the expansion of (1+x +x2 +x3 ........ xn)r
2)when there are m items of one kind and n items of other and so on then number of ways of choosing r items out of these items is
coefficient of xr in the expansion (1+x +x2 ........................xn)(1+x +x2 ........................xm) and so on
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