The sum of three numbers is 15. The sum of their squares is 125. What is the sum of the product taken two at a time? ( A ) 100 ( B ) 25 ( C ) 50 ( D ) cant determine
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The sum of three numbers is 15. The sum of their squares is 125. What is the sum of the product taken two at a time? ( A ) 100
( B ) 25
( C ) 50 ✔✔
( D ) cant determine
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