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If a^2+b^2+c^2=300 and ab+bc+ca = 50, th...

If `a^2+b^2+c^2=300` and ab+bc+ca = 50, then what is the value of a+b+c? (Given that a,b and c are all positive.)
यदि `a^2+b^2+c^2=300` है तथा ab+bc+ca = 50 है, तो a+b+c का मान क्या होगा ? ( यह मान लीजिए कि a,b तथा c सभी धनात्मक है )

A

22

B

20

C

25

D

15

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