Answer Posted / anne

It is 91.
2 3 4 15 12
12+(3*1)=15

3 4 5 28 20
20+(4*2)=28

4 5 6 45 30
30+(5*3)=45

5 6 7 66 42
42+(6*4)=66

6 7 8 ? 56
56+(7*5)=91

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