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prime place example

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 ?


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.