If a b=5 and 3a 2b=20,then (3a b)will be : | Examsbook

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If a b=5 and 3a 2b=20,then (3a b)will be :

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Answer : 3 25 Explanation : Answer: C) 25 Explanation: a b=5 ...(1) and 3a 2b=20 ...(2) Multiplying (1) by 2 and subtracting from (2), we get : a=10. Putting a=10 in (1), we get : b=-5 Therefore, (3a b) = 3 x 10 (-5)=30-5=25.

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