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r = 81/ 243 = 1/3
Un = a . r^(n-1)
Un = 243 . (1/3)^n-1 ---> 243 / 3^(n-1)
= 3⁵ . 3^(1-n)
= 3^(6-n) atau sama saja 243 / 3^(n-1) jawabnnya b
r = 9/27 = 1/3
un = ar^(n-1)
= 243 x 1/3^(n-1)
= 3^5 x 3^-1(n-1)
= 3^ ( -n +1+5)
= 3^ (6-n)