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Challenge Response 158


A special symbol

We have to find out what the rule of this operation is. Note that:

24 = 10 = 2 x 4 + 2
38 = 27 = 3 x 8 + 3,
427 = 112 = 4 x 27 + 4
51 = 10 = 5 x 1 + 5

We can conclude that the rule that defines the operation is theb = a x b + a.

Thus we have:

4(87) = 4(8x7 + 8) = 464 = 4 x 64 + 4 = 260.

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