Find the odd one: 21, 36, 55, 66, 91, 105

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21=4×5+1, 36=5×7+1, 55=6×9+1, 66=7×9+3 not fitting, 91=7×13, 105=7×15. Alternative: all others divisible by 3 or 7 with pattern. 66 is the odd as others are one less than multiple of  something.

Find the odd one: 21, 36, 55, 66, 91, 105 MCQ with Answer and Explanation

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