Problem:
Which triplet of numbers has a sum NOT equal to 1?
Answer Choices:
A. (21,31,61)
B. (2,−2,1)
C. (0.1,0.3,0.6)
D. (1.1,−2.1,1.0)
E. (−23,−25,5)
Solution:
1.1+(−2.1)+1.0=0. The other triplets add to 1.
Answer: D.
The problems on this page are the property of the MAA's American Mathematics Competitions