Question

4. The given A.P. is 1, 7, 13, 19,.... Complete the following activity and find
the serial number of the term 109 in the A.P.​

Answer 1

Step-by-step explanation:

Given,

AP => 1, 7, 13, 19

Then,

Common difference (d) = a2 - a1

= 7 - 1

= 6

For finding n,

an = a + (n-1) d

109 = 1 + (n-1) 6

108/6 = n-1

18 = n-1

19 = n

The serial number of the term 109 in the AP is 19.

Hope this helped you (and others as well). ☺️