Question

9^n+9^n-1+........+9^3+9^2+9^1. if n is greater than and equal to 4 (i.e 4,5,6,....) then for all values of n series is always divisible by

a. 7380
b. 729
c. 90
d. 9

Answer 1

sry sry sry

but I need to answer because I need points for knowing that answer