a,b,c are three positive numbers, such t...

a,b,c are three positive numbers, such that, (a+b+c) = 20,`a^2 +b^2+c^2=152`. The value of (ab+bc+ca) is equal to
दिया गया है कि a, b और c धनात्मक वास्तविक संख्याए है | यदि (a+b+c) = 20 है ,`a^2 +b^2+c^2=152` है, तो (ab+bc+ca) का मान किसके बराबर है ?

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