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prime place example

published by swaroop2011 on Sat, 04/26/2014 - 03:43
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General discussion

its says sum of each group of horizontally or vertically adjacent cells must be a prime number
But in column 3 of IB example: 1+3 =4 is not prime how is it valid?
or do i am missing something ?

Thanks
swaroop

Submitted by Ours brun on Sun, 04/27/2014 - 14:22.

Hi Swaroop,

The way I understand it, a group is made of all the considered connected cells. In your example you have to consider 1+1+3=5 since all three cells are vertically connected.

Bastien