Question

the 10th term of the ap whose sn=3n2-n​

Answer 1

Answer:

150

Step-by-step explanation:

• An A.P. is a series of numbers or elements following a specific series and it can be finite or infinite.

We will use the following idea to solve this given problem:

9th term = Sum of 9 terms - Sum of 8 terms

Given formula for sum of terms-

$\bold{ s_{n} = 3 {n}^{2} - n}$

Putting the value 9 in place of n,

=> S(9) = 3(9)²-9 = 243 - 9 = 234

Putting the value 8 in place of n,

=> S(8) = 3(8)²-8 = 192 - 8 = 184

Hence,

The 9th term of this AP = S(9)-S(8) = 234 - 184 = 150