Question

Which term of the A.P. 21,42,63,84,..is 420?

Answer 1

Answer:

21 is the term of an 420 thanks mate

Answer 2

a = 21

d = 21

tn = 420

n = ?

We know that;

tn = a + (n-1)d

420 = 21 + 21n - 21

420 = 21n

n = 420/21

n = 20

ANSWER:

420 is the 20th term

HOPE IT HELPS..♥