The sum of first three terms of an arithmetic series is 21. If the sum of the first two terms is subtracted from the third term

Question

2 years ago

10

then it would be 9. find the three terms of the series

1 answer:

Ronch [10] · Answer 1 · 2022-11-05T05:40:16+03:00

Ronch [10]2 years ago

5 0

Answer:

The terms are - 1, 7 and 15.

Step-by-step explanation:

Let the terms be a-d, a and a+d

ATQ, a-d+a+a+d=21, a=7. a+d-(a+(a-d))=9. d=8. The terms are - 1, 7 and 15.