Total 3 digit number =900 Divisible by 3=300‌‌ (Using ‌
900
3
=300 ) Divisible by 4=225‌‌ (Using ‌
900
4
=225 ) Divisible by 3 & 4=108,... (Using ‌
900
12
=75 ) Number divisible by either 3 or 4 =300+2250−75=450 We have to remove divisible by 48 , 144,192,....,18 terms Required number of numbers =450−18=432