Sum of the squares of 3 no. is 149 and the sum of their products taken two at a time is 70. Find the sum? Choose the correct choice from the following.
A) 17 B) 19 C) 21 D) 13 E) 18
(a + b + c)2 = a2 + b2 + c2 + 2(ab +bc + ca) = 149 + 2* 70   a + b + c = âˆš289 = 17   17nswer 17
<result>A</result>
Sum of the squares of 3 no. is 149 and the sum of their products taken two at a time is 70. Find the sum?