# Summing it up !!!

Algebra Level 3

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

What is the sum of all positive coefficients??

Details & Assumptions

$$\bullet$$ In expression $$(a+b)^{2}$$ , on expanding we get $$a^2+2ab+b^2$$ .Thus, coefficients are $$1,2,1$$ and sum of coefficients is $$4$$

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