Find out the next term in the following series.
1221, 13331, 144441, 1555551, ?
Show answer & explanation
Correct answer: C
Explanation
Series: 1221, 13331, 144441, 1555551, ?
Step 1: Identify the pattern
1221 → 1, followed by 2 repeated twice, then 1
13331 → 1, followed by 3 repeated three times, then 1
144441 → 1, followed by 4 repeated four times, then 1
1555551 → 1, followed by 5 repeated five times, then 1
The middle digit increases by 1 each time, and it is repeated a number of times equal to its value.
Following the pattern:
The next middle digit = 6
Repeat 6 six times between the two 1s
Thus, the next term is: 1 + (six 6s) + 1 = 16666661
Therefore, the correct answer is Option (3).