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December 22, 2014

December 22, 2014

Posted by **John** on Monday, April 22, 2013 at 3:44pm.

- maths -
**Steve**, Monday, April 22, 2013 at 4:28pmwe know that 2+(n-1)d = 29, so

d = 27/(n-1)

sum of first n terms is

n/2 (4+(n-1)d)

n/2 (4+(n-1)*27/(n-1)) = 155

n = 10

check:

d = 27/9 = 3

10th term is 2+9(3) = 29

S10 = 5(4+9(3)) = 155

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