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U6 / U3 = ar^5 / ar^2 = 168/21
= r^3 = 8
= r = 2
U6= ar^5
168= a × 2^5
168= a × 32
168/32 = a
5,25= a
U9= ar^8
= 5,25 × 2^8
= 5,25 × 256
= 1.344
MAAF SY HANYA BISA JWB NO.1