Look at the series of numbers given in the riddle and find the connection between them.
What comes next in the sequence;
1, 3, 9, 31, ?
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If you do a bit of calculation, you will notice that the numbers in the series are of the form;
nth term = n + (n – 1) x (n – 1)th term
So let’s try this equation out;
1 x 1 + 2 = 3
3 x 2 + 3 = 9
9 x 3 + 4 = 31
So to find the next missing number;
31 x 4 + 5 = 129 = Next number.