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give shortcut to this question .
what is the coefficient of x^5 in ( 1+ 2x)^6 * (1 - x)^7
Do not open this expression fully just consider only those in which u think power will come five.
Do a little bit of thinking in ur minds first like:
(1+2x)^6 * (1-x)^7
= (1+2x)^3(^2) * (1-x)7.
Then in the next step dont write the powers in which there is no power 5.
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