sum of the coefficients

Algebra Level 3

What is the sum of the coefficients in the expansion of ( 2 x − 1 ) 20 (2x-1)^{20} ?

3 2 0 1

Lorenz Navales by lorenz navales , 21, Philippines

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1 solution

Substitute 1 1 to the variable then substitute.

( 2 − 1 ) 20 = 1 20 = 1 (2-1)^{20}=1^{20}=\boxed{1}

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