Question

3 +8+13 + 18+. . . . . . . Sum of
the 8 terms of this A. P. is​

Answer 1

Step-by-step explanation:

Here, First term a=3 and common difference d=5

Now,

t

n

=a+(n−1)d

⇒t

n

=3+(n−1)×5

⇒t

n

=3+5n−5

⇒t

n

=5n−2

Answer 2

Answer:

Sn=n/2(2a+(n-1)d)

Sn=8/2(2×3+(8-1)5)

Sn=3(6+35)

Sn=3(41)

Sn=123