2+3=8, 3+7=27, 4+5=32, 5+8=60, 6+7=72 then 7+8=??

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The answer is 98: 
2 + 3 = 2 * ( 2 + 3 ) - 2 = 8 
3 + 7 = 3 * ( 3 + 7 ) - 3 = 27 
4 + 5 = 4 * ( 4 + 5 ) - 4 = 32
5 + 8 = 5 * ( 5 + 8 ) - 5 = 60 
6 + 7 = 6 * ( 6 + 7 ) - 6 = 72 
7 + 8 = 7 * ( 7 + 8 ) - 7 = 98

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