$$A$$ 
Divide $$4$$、$$9$$、$$10$$、$$14$$、$$15$$ and $$21$$ into 2 groups with 3 numbers in each group to make the product of numbers in each group the same. How can we divide the numbers? 

1. $$(14,9,10), (21,15,4)$$ 
2. $$(14,21,10), (9,15,4)$$ 
3. $$(14,4,10), (21,15,9)$$ 
4. $$(14,15,9), (21,10,4)$$ 