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0 and 49, added together.
How about 7 times 7 = 49 as one example
1,4,9,16,25,36,49
nCr = n!/((n-r)!r!) → 49C8 = 49!/((49-8)!8!) = 49!/(41!8!) = 450,978,066 combinations.
The two square numbers that add up to 85 are 36 and 49. Specifically, 36 is (6^2) and 49 is (7^2). When you add them together, (36 + 49 = 85).