Question

How many 6 digit numbers are divisible by either 3 or 7 but not by 42 explain me?

Answer 1

Greatest 6 digit number which is divisble by 3 = 999999

Smallest 6 digit number which is divisible by 3 (a)= 100002

d=3

numbers = n

100002 + (n-1)3 = 999999

(n-1)3 = 899997

n-1 = 299999

n = 299998

Greatest 6 digit number which is divisble by 7 = 999999

Smallest 6 digit number which is divisible by 7 (a)= 100002

d=7

numbers = n

100002 + (n-1)7 = 999999

(n-1)7 = 899997

n-1 = 128571

n = 128570

numbers divisible by 3 = 299998

Numbers divisible by 7 = 128570