1.

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

Answer»

ANSWER:

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



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