Question

if a=1/5 and d =2/3find 18 and n of ap

​

Answer 1

Answer:

Step-by-step explanation:

an= a +(n-1)d

=1/5+(8-1)*2/3

=1/5+17*2/3

=1/5+34/3

=3+170/15

=173/15

Answer 2

Answer:

No. of ad = 21

Step-by-step explanation:

a = 1/5

d = 2/3

so, Xad = 18 (here X is represent no. of ad)

then, X* 1/5 * 2/3 = 18

X * (3+10)/15 = 18

X * 13/15 = 18

X = 18 * 15/13

X = 21 (approx)

X = 20.7692307692...(exect value)

Mark as Brainliest answer