The coefficient of 3 in 19x3 is
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irst expand the term (1 + 2x )^4 by binomial expansion. (1 + 2x )^4 = ^4C0 (1)^4 (2x)^0 + ^4C1 (1)^3 (2x)^1 + ^4C2 (1)^2 (2x)^2 + ^4C3 (1)^1 (2x)^3 ...
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what do you mean........??
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