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In the expansion of (1+ax)^4, the coefficient of x^3 is 1372. Find the constant a.
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So the coefficient of x^3 is
Can you solve this now?
By the binomial expansion, .
Solve for a.
Understand the pattern.
Thanks, i got it now, i had to equate the 4C3 part of the expansion to 1372x^3
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