Question

(2) In an A. P., a = 5, d = 0 ; find ts
(A) 25
(D) 5
(B) 9
(C) 0
(3) Write the value of x in the A. P. 3, 7, 11, x, 19
(A) 16 (B) 18
(C) 15
(D)17​

Answer 1

Answer:

3) The value of x will be 15.

The common difference (d) is 4

n=4th term

a=3

so by applying the formula

an=a+(n-1)d

=3+(4-1)4

=3+ 3×4

=3+12

=15