DAY 152:

Today’s Challenge

Using the three numbers 1, 2 and 4 just once each, with + – × ÷ available to you, what is the lowest positive number it is NOT mathematically possible to make?

The 7puzzle Challenge

The playing board of the 7puzzle game is a 7-by-7 grid of 49 different numbers, ranging from up to 84.

The 3rd & 7th rows contain the following fourteen numbers:

4    11    13    24    25    27    30    36    42    45    66    70    77    80

Which two numbers have exactly four factors each?

Answers can be found here.

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