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It is 81 because the rest of them are prime numbers squared and 9 is not a Prime number because it has more than two factors.

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Q: Which number does not belong to the following sequence of numbers 9 25 49 81 121 and 169 giving a reason why?
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What number does not belong to this sequence of numbers 9 25 49 81 121 and 169 giving a valid reason why not?

It must be 81 because 9 squared is 81 and 9 is not a prime number whereas the other numbers are squared prime numbers.


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