Question

fond the nth term of the sequence 3,813,18...​

Answer 1

✍Hey mate✍

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

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

tn =a+(n−1)d

• ⟹78=3+(n−1)5
• ⟹78=3+5n−5
• ⟹78=5n−2
• ⟹5n=80orn=16.

The 16th term is 78.

Hope it helps.