Question

4. Which term of the AP:3, 8, 13, 18,...,is 78?
5
Find the number​

Answer 1

Step-by-step explanation:

Given

AP: 3 , 8,13,18,..is 78?

a = 3

d = 8-3 = 5

an = l = 78

n = ?

$\fbox \red{an = a +( n - 1)d}$

$78= 3 + (n - 1)5$

$78 - 3 =( n - 1)5$

$\frac{75}{5} = n - 1$

$n = 15 + 1$

$\fbox \green{n = 16}$

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