Find the number in the place of ?? - 6 . 7 . 8 . ?? . 56

Find the Number in the place of ??
2 . 3 . 4 . 15 . 12
3 . 4 . 5 . 28 . 20
4 . 5 . 6 . 45 . 30
5 . 6 . 7 . 66 . 42
6 . 7 . 8 . ?? . 56
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Answer is 91