Jawabanmu

2014-04-15T04:35:23+07:00
Ar² = 24 -> a = 24/r²

ar⁹ = 3072 = 24/r² . r⁹ = 3072 = 24 . r⁷ = 3072

r⁷ = 3072/24 = 128
r = 2

a = 24/2² = 24/4 = 6

U₇ = 6.2⁶ = 6.64 = 384
       
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