#### Question

The first term and the common difference of an A. P. is 10,000 and

2000 resectively. Find the sum of first 12 terms of the A.P.

#### Solution

a = 10,000, d = 2000 , S12 = ?

`S_n = n/2[2a+(n-1)d]`

`∴ S_12 = 12/2 [2xx10,000+(12-1)xx 2000]`

`=6(20,000+11 xx 2000)`

`=6(20,000 + 22,000)`

`= 6xx42,000)`

`=2,52,000`

Is there an error in this question or solution?

Solution The First Term and the Common Difference of an A. P. is 10,000 and 2000 Resectively. Find the Sum of First 12 Terms of the A.P Concept: Arithmetic Progression.