sum of the squares of 3 no . ' s is 62 and the sum of their products taken two at a time is 131 . find the sum ?
"( a + b + c ) 2 = a 2 + b 2 + c 2 + 2 ( ab + bc + ca ) = 62 + 2 * 131 a + b + c = √ 324 = 18 d"
sqrt(add(multiply(131, const_2), 62))