Question 1071667
.
Q. {{{highlight(cross(Number))}}} Numbers 2,3,4 and one more number are written in the cells of 2 x2 table. It is known that the sum of the number 
in the first row are equal to 9  and the sum of the number in the second row is equal to 6. the unknown number is
a)5     b)6     c)7     d)8
~~~~~~~~~~~~~~~~~~~~~~~~


<pre>
The numbers 3 and 4 CAN NOT be in one line.

The numbers 2 and 3 CAN NOT be in one line.

It implies that 3 is in one line with the unknown number and 2 and 4 are in one line.

2 + 4 = 6,

so 2 and 4 are in the second line.

Then 3 and X are in the first line, which implies that the unknown number is 9-3 = 6 in the first line.
</pre>

<U>Answer</U>.  Option b).