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=a = 12/4
= a = 3
ar^6/ar² = 94/ 12
r = 16+4 = 20 / 2
r =10
Sn = a( r^n -1) / r-1
S10=3(10^10 - 1) / 10 -1
= 3(10000000000-1) / 9
=30000000000-3 / 9
= 333.333333333
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