What is the 12th term of 5, 10, 15, ...?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 60.
This is an arithmetic sequence:
5, 10, 15, ...
First term a=5
Common difference d=5
Use the formula for the nth term:
an = a + (n−1)d
For the 12th term:
a12 = 5+ (12−1) × 5
= 5 + 11 × 5
= 5 + 55 = 60
So, the 12th term is 60.