## Winning IQ Tests

Ever made an IQ test? You may remember one of those questions where you are given a sequence of numbers and you have to add the next following number. There may be more valid answers than you may think.

An example for a given sequence might be `1, 1, 2, 3, 5`

. So, what’s the next number? Some of you may have recognized the beginning of the Fibonacci sequence, in which case the next number would be `8`

.

But there are more valid answers. For example, you could answer `9`

. In this case your sequence represents the number of nodes in row *n* of the power tree or the maximal determinant of real *n*×*n* symmetric (0,1) matrices. Easy, isn’t? đŸ˜‰

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