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Find the total number of terms in the ex...

Find the total number of terms in the expansion of `1(1+x+y)^(10)` and cofficient of `x^2 y ^3`.

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Total number of terms `=""^(10+3)C_(3-1)= ""^(12)C_(2)=66`
Coefficient of `x^2y^3=(10 !)/(2 ! x x 3 ! x x 5 !)= 2520`
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