49
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121As 100 = 102 then the next largest square number will have to be 112 which is equal to 121.
144 121 100 81 64 next one would be 49. my guess is the 122 is a typo. so its 12x12 11x11 10x10 etc
The given number sequence is a series of perfect squares: 7^2, 8^2, 9^2, 10^2. Therefore, the next number in the sequence would be 11^2, which is 121.
112 = 121 and 122 = 144.
121