Question 201610: which is the 9th term of the sequence which has a first term of 1 and has a common ratio of 1.5
Answer by RAY100(1637)   (Show Source):
You can put this solution on YOUR website! Geometric sequence has form,,,,a(n) = a(1) r^(n-1)
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given,,,a(1) =1,,,r=1.5
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a(n) = 1* 1.5^(n-1)
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for n=9,,,,,a(9) = 1*1.5^8 = 25.629
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checking,, 1,,1.5,,2.25,,,3.375,,5.0625,,7.59375,,11.390,,17.086,,25.629,,,,,ok
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