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What is the sum of coefficients in (x-2y+3z)^20?
The answer is 2^20
They have taken x=y=z=1
=(1-2+3)^20
=2^20.
Can you please explain why x, y, z is taken as 1?
sum of coefficients means where not be any variable term and thats we have taken x y z as 1
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