What is the "row heading" of the third row (marked with the question mark) in the table shown below?

    4 :  6, 11,  7
    3 :  8,  4, 12
    ? : 10, 55, 15

Explain the scheme used.

8

The row header is the leftmost digit of the product of the three numbers:

6 * 11 * 7 = 462 => 4
8 * 4 * 12 = 384 => 3
10 * 55 * 15 = 8250 => 8

Posted by Happy on 2002-05-21 07:10:42