21 If a b c are real numbers such that ab/a+b =1/3 bc/b+c=1/4 ca/c+a=1/5 then find the valie of abc/ab+bc+ca

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Q. If

a, b, c

are real numbers such that

\frac{a b}{a + b} = \frac{1}{3}, \frac{b c}{b + c} = \frac{1}{4}

and

\frac{c a}{c + a} = \frac{1}{5}

, then the value of

\frac{a b c}{a b + b c + c a}

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a, b, c

are nonzero real numbers such that

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a, b, c

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a^{2} + b^{2} + c^{2} = 1

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, is:

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