Question

an=(1/2)^n-1 start with n=1 and first 5 terms

Answer 1

a1=(1/2)^1-1
=(1/2)^0
a1 =1
a2=(1/2)^2-1
=(1/2)^1
a2=1/2
d =( 1/2)-1
d = (-1/2)
a5= 1+ (5-1)*(-1/2)
= 1+4^(-1/2)
= 1+(1/(2^2(1/2))
= 1+(1/2)
a5=3/2