Question

Find the 19th term of the following A.P.

7, 13, 19, 25.......
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Answer 1

Step-by-step explanation:

a= 7

d=a2-a = 13-7

= 6

a19 =a+18d

=7+18×6

=7+108

=115

Answer 2

✰given

a = 7

d = 13 - 7 = 6

n = 19

__________________________

✰solution.

A.P's formula..

a + { n - 1} × d

so,

an19 = a +( n - 1 ) × d

an19 = 7 +( 19 - 1) × 6

an19 = 7 + 108

an 19 = 115