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What is the sum of the geometric sequence 4, 12, 36 … if there are 9 terms?
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ok well first you have S=4(1-3^9) take ans and divide by -2
i got 39364
duz it help? geonetric summation formula is summation=1st term * 1-common ratio to the nth power. take ans and divide by 1-common ratio
yeah thank u!
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