Question

Find the coefficient of x³y⁴

in the expansion of (x + y )⁷.

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Answer 1

Step-by-step explanation:

nCr a ^n-r b^r

7Cr x^7-r b^r

Coefficient of x³y⁴

7-r = 3 or r = 4

Coefficient = 7C4 = 35

Answer 2

Answer:

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