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What is the next number in the sequence 1 121 12321 1234321

User Netpoetica
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2 Answers

3 votes
The next number is 123454321
User Edward Peters
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4 votes

Answer: 123454321

Explanation:

The given sequence :
1\ 121\ 12321\ 1234321

We can note that this is a symmetric sequence i.e. the digits in the numbers of the sequence are symmetric .

In the first number there is 2 in the middle and 1 is symmetric.

In the second number there is 3 in the middle and 1 and 2 are symmetric.

Similarly In the third number there is 4 in the middle and 1,2 and 3 are symmetric.

Then in the next number there must be 5 in the middle and 1,2,3,4 must be symmetric.

Hence, the next number must be 123454321

User Novitchi S
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