Question

Find the next term of the sequence: 1, 11, 121, 1221, 12321, 123321, 1234321 …

• A. 12345321
• B. 12344321
• C. 12354321
• D. 12344231

Answer 1

The correct option is B 12344321

Here the sequence is following a pattern according to the following rule.

If the nth term is odd, then find m = (n+1) /2

Then the nth term will be

12…(m-1) m (m-1)...21

If the nth term is even, then find m = n/2

Then the nth term will be

12….(m-1) mm (m-1)....21

In the given question we have to find the 8th term

So m = 8/2 = 4

So the next term is 12344321