Question

What is the sum of the first 10 terms of the AP?​

Answer 1

The sum of n terms of AP is the sum of first n terms of the arithmetic sequence.

Here we can take n = 10 as given in the question.

So,

1+2+3+4+5+6+7+8+9+10 = 55

If you wish for a formula,

S = n/2[2a + (n − 1) × d]

• n= 10 (according to question)
• a= 1 (according to question)
• d= 2-1=1 (according to question)