Question

if 5th term of an ap is 15 and 15th term is 5 find the 20th term​

Answer 1

5th term: a+ (5–1)d = 15 ; given a+4d =15

20th term: a+ (15–1)d = 5 ; given a+14d= 5

Hence we get 10d = -10; d = -1; and a = 19.

Hence the first term of the series a = 19; common difference = -1;

Hence 20th term = a + (20–1 ) d ; = a+19d = 19-19= 0

{ Mark as Brainliest if it helps , ⚡ Thank you }