Simple...
you have: |-25|
What is the value?
-->> 25
Thus, your answer.
7, -13 should be 2
-2, -10 should be -6
Answer: its either A or C, but im p sure its C
You have to pay attention in this:
- The order doesn't matter
- No repetition
- You can not chose all available elements (just 4)
So in this case your formula must be: 9C4= 9!/(4!*(9-4)!) = 126 ways
