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In the expression : (1−x)10(1-x)^{10}(1−x)10
What is the sum of all positive coefficients??
Details & Assumptions
∙\bullet∙ In expression (a+b)2(a+b)^{2}(a+b)2 , on expanding we get a2+2ab+b2a^2+2ab+b^2a2+2ab+b2 .Thus, coefficients are 1,2,11,2,11,2,1 and sum of coefficients is 444
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