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Question

If a, b, c are real numbers such that a + 2b + c = 4 then max. value of ab + bc + ca is

A
2
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B
4
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C
6
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D
8
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Solution

The correct option is B 4
Given (a+b)+(b+c)=4
But [(a+b)+(b+c)2]2[(a+b)(b+c)], A.M.G.M.
or (42)2ab+bc+ca+b2
4b2ab or ab4b2
Max. value of ab=4(b)

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