Question

Which term of the A.P. 3, 8, 13, 18, … is 78?
please fast​

Answer 1

Answer:

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.

Answer 2

Answer:

Which term of the A.P. 3, 8, 13, 18, … is 78?