Question

please tell me
answer of this question​

Answer 1

Answer:

a- 6

d-3

n-25. n-15

an= a+[n-1]d. an= a+[n-1]d.

=6+(25-1)3. =6+(15-1)3

=6+24(3). =6+(14)3

=6+72. =6+42

=78. =48

an25=78. an15=48

an25-an15

=78-48

=30