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a) a=7-4=3 

b+c=7, b is 4.

a=3 ; b=4 ; c=3



b) Substitute values from part a.

_{7}C_3\times(3x)^4\times(4)^3

35\times81x^4\times64

181440x^4

The coefficient of the term in x^4 is 181440.

Explanations

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