Question

If the sum of first 7 terms of an AP is 49 and the first 17 terms is 289, find the sum of first 15 terms . .... (class 10)​

Answer 1

Step-by-step explanation:

sum of first 7terms is 49/7=7

sum of first 17 terms is 289/17=17

sum of first 15terms is 15*15=225