Question

If in an AP a = 84, d = 4 and a, = 0, find n.​

Answer 1

To find the value of 'n'

we need the nth term.

Answer 2

Answer:

a = 84, d = 4 , a = 0 ....( given)

to find = n

solution = tn = a + ( n - 1 ) x d

= 84 + ( n - 1 ) x 4

= 84 + 4n - 4

= 80 + 4n

n = 80/ 4

20

n = 20