Which number replaces the question mark?

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1   2   3   =   8
(1+3) x 2 = 8

2   3   4   =   18
(2+4) x 3 = 18

3   4   5   =   32
(3+5) x 4 = 32

4   5   6   =   50
(4+6) x 5 = 50

5   6   7   =   ?
(5+7) x 6 = 72

Answer is: 72