Question

3+8+13+18+.................sum of the 8tirms of this A.P is​

Answer 1

The given sequence is 3, 8, 13, 18, ....78.

'a' = 3, 'd' = 5, last term = 78, 'n' = ?

t

n

=a+(n−1)d

⟹78=3+(n−1)5

⟹78=3+5n−5

⟹78=5n−2

⟹5n=80orn=16.

The 16th term is 78.

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Answer 2

Answer:

164

Step-by-step explanation:

a=3

d a2-a1 = 8-3 = 5

s8 = ?

so sn = n/2 (2a+(n-1) d)

s8 = 8/2 ( 2(3) +7(5))

s8 = 8/2 (6+35)

s8 = 8/2 * 41

= 4*41

= 164

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