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= ∑7.(3/4)ⁿ - ∑3.(1/2)ⁿ
ada dua deret geometri:
21/4 , 63/16.....dst... a₁= 21/4, r₁= 3/4
3/2 , 3/4.....dst... a₂= 3/2, r₂= 1/2
Sn= (a₁/(1-r₁)) - (a₂/(1-r₂))
= ((21/4)/(1-(3/4))) - ((3/2)/(1-(1/2)))
= 21 - 3
= 18.....opsi D