Question

1+s+s^2+s^3+S^4+……S^N 证明算法

Answer 1

T=1+s+s^2+s^3+S^4+……S^N

ST=s+s^2+s^3+S^4+……S^N+S^N+1

T-ST=1-S^N+1

(1-S)T=1-S^(N+1)

T=[1-S^(N+1)]/(1-S)