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u3 = ar^2 = 36
a. r ^2 = ar^3/a = 36/4 = 9
r = √9
r = 3
b. un = a r^n-1
= 4 x 3^n-1
= 4 x 3^(n-1)
c. 4x 3^(n-1) = 972
3^ (n-1) = 243
3^(n-1) = 3^5
n - 1 = 5
n = 6