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Pick out the odd in the following-
64 - 100
36 - 45
48 - 90
29 - 85
HCF (64, 100) = 4 -> perfect squareHCF (36, 45) = 9 -> perfect squareHCF (48, 90) = 6 -> not a perfect squareHCF (29, 85) = 1 -> perfect square
So, 48 - 90 is the odd man out.
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