How many ways are there to pick 2 squares of different colors?

[(7*9)+(5*11)+(3*13)+(1*15)] / 2

[63+55+39+15] / 2

172 / 2

86

The answer is 86.

There are 5 mangoes and 6 bananas. In how many different ways can a selection of fruits be made if all fruits of same kind are numbered with different tags.