Puzzle Solutions, Issue 04

Warning: Contains SPOILERS!

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These solutions relate to puzzles found in Issue 04 of the magazine.

Odd sums

The sum of the first n odd numbers is n2 (this can be proved by induction). This means that:

sum of the first n odd numberssum of the next n odd numbers=n2(2n)2n2=n23n2=13

Odd squares

1 and 9 are the only two square numbers whose digits are all odd.

Two lines

The co-ordinates will be (1,gradient+intercept).

Matthew is a research software engineer (RSE) in the Advanced Research Computing Centre (ARC) at University College London (UCL). His hobbies include pretending to be called Humbug (H).

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