the sum of first six terms of an AP is 42. The ratio of 10th term to its 38th term is 1:3.calculate the fist term and 13th term of the AP .​

Question

the sum of first six terms of an AP is 42. The ratio of 10th term to its 38th term is 1:3.calculate the fist term and 13th term of the AP .​

in progress 0
1 month 2021-08-18T11:45:08+00:00 2 Answers 0 views 0

1. /* We know that, */

•••♪

2. Answer: First-term = 14/3, 13th term = 238/15

Step-by-step explanation:

The sum of the first 6 terms = 42

Ratio of 10th and 38th term = 1:3

From (1) and (2);

a = 14/3 = First term

d = 14/15

So, 13th term = a+12d = 238/15

(I hope it will be marked as Brainliest)