Solution of math IQ -Notepedia

Q. Find the missing value represented by question marks.





Solution:
The answer of this problem is 98. And the equation for the solution is N * (N-1) + (N-2), where N is the first number of a column. 
So, In the first column, 3*2+1 = 7
In the second column 5*4+3 = 23
In the third column 7*6+5 =  47
In the fourth column 9*8+7 = 79
In the fifth column 10*9+8 = 98
Don't add 1 3 5 7 9 respectively in each column because in the first row, members are 3 5 7 9 and then 10  but, not the 11.

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