7+99d = 502
50/2 (14+49d) = _____
The first term of an arithmetic progression is 7 and the 100th term is 502. Find the sum of the first 50 terms.
3 answers
Not understanding what you just did oobkeck
In that case, you need to review APs, and the formula for the sum of the first n terms -- which I gave you. I just wrote the facts they gave in algebra.
Find d, then use it in the formula.
Find d, then use it in the formula.
2 answers