In the following question, select the number which can be placed at the sign of question mark(?) from the given alternatives.
The product of the first and second numbers in each row is substracted by the first number to obtain the third number.
Row 1 :Â $$6\times13-6 = 78-6 = 72$$
Row 2Â :Â $$4\times7-4 = 28-4 = 24$$
Row 3Â : $$9\times11-9 = 99-9 = 90$$
Hence 90 will come in place of the question mark.
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