Question

if traffic signals are mounted at 3m,8m,13m and last at 253m from a cross way on a road then find the distance at which 20 signal is mounted​

Answer 1

The distance at which "20 signal is mounted​ at 98 m".

Step-by-step explanation:

The traffic signals are mounted at 3m,8m,13m and last at 253m from a cross way on a road.

Here, first term(a) = 3 m, common difference (d) = 8 m - 3 m = 5 m

and last term(l) = 253 m

The distance at which 20 signal is mounted​($\displaystyle a_{20}$ )= ?

∴ $a_{20}$ = a + (n - 1)d

= 3 + (20 - 1) ·5

= 3 + 19 ·5 = 98

Hence, the distance at which "20 signal is mounted​ at 98 m".