Summing it up !!!

Algebra Level 3

In the expression : (1x)10(1-x)^{10}

What is the sum of all positive coefficients??

Details & Assumptions

\bullet In expression (a+b)2(a+b)^{2} , on expanding we get a2+2ab+b2a^2+2ab+b^2 .Thus, coefficients are 1,2,11,2,1 and sum of coefficients is 44

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