Answer:
Step-by-step explanation:
unit place can be filled with 3,5,7,9
number of ways=4
tens place can be filled with 2,3,5,7,8,9
number of ways=6
Hundreds place canbe filled by 2,3,5,7,8,9
number of ways=6
thousands place can be filled by 2,3,5
number of ways=3
total number of ways=3×6×6×4=432 ways.
total number of digits=432
