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Find missing number 2 3 4 15 12 3 4 5 28 20 4 5 6 45 30 5 6 7 66 42 6 7 8 -- 56?
Wiki User
∙ 13y ago
56 + 35 = 91.
Each pair of numbers not in the runs from lower to higher differ by the number after them times that number minus two. So:
15 - (3)(1) = 12
28 - (4)(2) = 20
45 - (5)(3) = 30
66 - (6)(4) = 42
91 - (7)(5) = 56
Wiki User
∙ 13y ago
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