What is the coefficient of ?

What is the coefficient of \( x^5~in~(x+3)^6 \)?

Expert Solution

Let the coefficient of \( x^5 = ~nC_r \).

Proceed as follows:

Thus, the cofficient of \( x^5=18 \).

The cofficient of \( x^5=18 \).

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What is the coefficient of ?

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