## A special symbol

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

2**4 = 10 = 2 x 4 + 2**

3**8 = 27 = 3 x 8 + 3,**

4**27 = 112 = 4 x 27 + 4**

5**1 = 10 = 5 x 1 + 5**

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

Thus we have:

4**(8****7) = 4****(8x7 + 8) = 4****64 = 4 x 64 + 4 = 260.**

Back to the statement