science
posted by David .
What is the definition of Mathematics?
a.adding and subtracting numbers
b.the science of patterns and relationships
c.the science of numbers
d.a really hard subject

Hmm 
Mathematics involves multiplication and division, too. So a) isn't right.
Check this dictionary definition to find the right answer.
http://dictionary.reference.com/browse/mathematics 
c.the science of numbers .???????

Is that what the definition says?

ops!
b.the science of patterns and relationships 
Right. Frankly, my guess was the science of numbers, but the dictionary set me straight. <g>