Question 179
Some equations are solved on the basis of a certain system. Find the correct
answer for the unsolved equation on that basis.
5 × 8 = 28, 3 × 7 = 12, 8 × 6 =
35, 13 × 13 = ?
Solution
If in a given system 5 × 8 = 28, 3 × 7 = 12, 8 × 6 = 35 then it can be generalized as :
a × b= (a-1)× (b-1).
therefore the value of 13 × 13 will be 12 × 12=144. option D.
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