Question

the 35th term of ans A.P is 69. what is the sum of its 69 terms

Answer 1

The sum of 69 terms of the ap would be 69a where a is the first term

Answer 2

a35=a+34d
69=a+34d
s69= 69/2{2a+(69-1)d}
69{a+34d}
69×69=4761