Which of the following is the product of two integers whose sum is 15? Pick one.
A) -42  B) -28  C) 12  D) 26  E) 32
I solved this Question like this,   Let the two integers are x,y   x+y=15 (Given)   xy=? (Needed)   instead of solving this algebraically, Test the Answer choices   D. 26   Do the factorization : (1,26)----&gt; There sum is not 15--eliminate   (2.13)----&gt;There sum is 15 Bingo!!!!   So, my answer is D...   As the answer is in D, it took me very less time to answer the question. but i think this method is be simple and efficient.
<result>D</result>
Which of the following is the product of two integers whose sum is 15?