Question

Six x's have to be placed on the squares of given figurr such that each row contaons atleast one x

Answer 1

As every X is identical, then the question is of the selection of six squares from the eight squares.

And hence no row remains empty.

In this given question, R1 comes with 2 squares, R2 has four squares and R3 comes with 2 squares.

Then the number of selections are 2 C1 x 4 C4 x 2 C1 + 2 C1 x 4 C3 x 2 C2 + 2 C2 x 4 C3 x 2 C1 + 2 C2 x 4 C2 x 2 C2.