Question

sum of 15 terms of an AP is 600, and the common difference is 5. find the first term

Answer 1

Tn = a + (n-1)d
T15 = a + (15-1) 5

600 = a + 14* 5
600 = a + 70
a = 600- 70
a = 530.

the first term of an AP is 530.



hope it helps
Thanks..