Coefficient of Y+y2+4
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1
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2, 4.
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The general term is
tr=5Cr.(y2)r.(yc)5−r
If the power of y in above general term should be 1, we have,
2r−(5−r)=1 which gives r=2.
Putting this value of r in the general term expression, we get the coefficient of y
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