Lessons

General Aptitude
10.1 Problems on H.C.F and L.C.M - General Questions

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Q.

If a - b = 3 and a2 + b2 = 29, find the value of ab.

View Answer

Correct choice: A

Explanation:

2ab = (a2 + b2) - (a - b)2

   = 29 - 9 = 20

   ⇒ab = 10.

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