Question

Determine the A.P whose fifth term is 19 and the difference of the eight term from the twenty first term is 20.

Answer 1

Hi!
Here's your answer>>>>
a5=19
a+(5-1)d=19
a+4d=19 (1)

a20-a8=20
a+(20-1)d-(a+(8-1)d)=20
a+19d-(a+7d)=20
a+19d-a-7d=20
12d=20
d=20/12
d=5/3
Putting d=5/3 in Equation 1
a+4d=19
a+4×5/3=19
a+20/3=19
a=19-20/3
a=57-20/3
a=37/3

AP > 37/3,42/3,47/3...........................

Please mark it as brainliest............................

Answer 2

I did not understand the answer