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1 solution
when we make all the numbers opposite like 61 as16, 52 as25, 63 as 36, 94 as 49 , 46 as 64. we see that all of these are squares so our next number should be 18 as81 61-16-square of 4 52 -25-square of 5like this 46-64-square of 8 so square of 9-81-18