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The expansion of ${(x + y + z)}^{n}$ is given by

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∑n!p!q!r!xpyqzr where p,q,r≥0,p+q+r=n

∑n!p!q!r!xpyqzr, where p+q+r=n

∑(n+1)!p!q!r!xpyqzr,where p+q+r=n

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Correct option is A

(x + y + z)n =∑n!p!q!r!xpyqzr where p+q+r=n

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The expansion of (x + y + z)n is given by

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The expansion of ${(x + y + z)}^{n}$ is given by