A tsunami hits the coast of a heavily populated island.

Which effect might occur?

0.24 or 24 %

Explanation:

We know that from the given :

Pairwise concordant =

   Here, C = concordant pairs

             D = discordant pairs

Basically concordant pairs = both of twins consumed mushroom( ) + One of the twins consumed mushrooms ( ).

Concordant pairs =

                            = 2 + 10

                            = 12

And in discordant pair, none of the pair consumed mushroom = 38

Therefore, pairwise concordance    =

                                                           = 0.24