Subject
Quantitative Aptitude
Topic
Solution
If a2+b2=45 and ab=18, find 1/a+1/b
If a2+b2=45 and ab=18, find 1/a+1/b
ক)
1/3খ)
2/3গ)
1/2ঘ)
Cannot be determinedExplanation
a2+b2 + 2ab = (a+b)2 or, 45 + 18*2 = (a+b)2 or, 81 = (a+b)2 or (a+b) = +- 9 Now, 1/a + 1/b = (a+b) /ab = +- 9 / 18 = +- 1/2Related questions
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