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Question:
by Tests and Tutors - Friday, 9 January 2009, 12:10
  If q, r, and s are consecutive even integers and q < r < s, which of the following CANNOT be the value of s^2- r^2
  1. 16
  2. 12
  3. 7
  4. 0
  5. -20
Reply
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Re: Question:
by aaa aaa - Wednesday, 2 September 2009, 08:00
 

The question/answers are not correct. The question says q,r and s are even consecutive integers.

1. 16-> 4q+12 = 16. so q has to be 1 but q is even. Hence this is not possible

2. 12->4q+12 = 12. So q=0, but q is even. Hence this is not possible

3. 7->4q+12 = 7. So q=-5/4 and hence q is NOT even. Hence this is also not possible

4. 0-->4q+12 = 0. So q=-3 and q is NOT even. Hence this is NOT possible

5. -20->4q+12 = -20. So q=-8 and hence q is even. This is also possible

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