Answers

  • Brainly User
2014-09-07T23:17:01+05:30
18x1 - 1³ = 17
17x2 - 2³ = 26
26x3 - 3³ = 51
51x4 - 4³ = 140
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2014-09-08T17:23:11+05:30
Here no.of terms equals to 5 we have to find 5th term then by A.P. a(n+1)d
d= 17-18=-1 then 18.6.(-1) =-108
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