Sunday

February 1, 2015

February 1, 2015

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

**Answer this Question**

**Related Questions**

Maths - The 3rd term of an AP is 10 more than the first term while the fifth ...

maths - Given that the first term of an A.P is 7 and its 10th term is twice its ...

Maths - The 5th term of an exponential sequence is 4 and of 2nd term is 35(¡)...

Math ( Can You check my Work?) - 1.an = 3n - 1 2. an = 2(2n - 3) 3.an = 4^n 4.an...

maths - The thirteenth term of an arithmetic progrssion os 27 and the seventh ...

maths - The thirteenth term of an arithmetic progrssion os 27 and the seventh ...

maths - The sum of the 3rd and 7th term of an A.P is 38 and the 9th term is 37.....

Maths - A geometric progression has a third term of 20 band sum to infinity ...

Maths - Arithmetic Progression - The fourth term of an AP is 8 and the sum of ...

maths - 1) The first term of arithmetic progression is -20 and the sum of it's ...