Question

1+2+2^2 +2^3+........+2^n-1 = 255, then find the value of n​

Answer 1

Answer:

Tn=255

arⁿ-1/(r-1) =255

1×2ⁿ-1/(2-1) =255

2ⁿ=255+1=256

2ⁿ=2^8

n=8