Fill in the missing prime factors.
a-2,b-5,c-5,d-3,e-2
a-3,b-2,c-2,d-5,e-2
a-2,b-3,c-3,d-1,e-10
a-3,b-2,c-3,d-2,e-5
6=(3)×(2)
10=(5)×(2)
10=(2)×(5)
30= (10)×(3)
The prime factors of 48 is written as 48=2×2×2× ___ ×3. Find the missing number.