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10,40,90,61,? what is next number?
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A
52
💡 Explanation:
The sequence is based on the squares of numbers 1-5 with their digits reversed: 01^2=01 (10), 02^2=04 (40), 03^2=09 (90), 04^2=16 (61). The next is 05^2=25, which reversed is 52.