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Question

How many terms of the series 2+6+18+...must be be taken to make the sum equal to 728?

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Solution

a=2
an=728
r=62=3
Sum=a(rn1)r1
728=2(3n1)31
728+1=3n
729=3n
n=6.

1207152_1319616_ans_7ebb297e9b8446228cec6352fba8e68d.jpg

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