How many 3 digit numbers are divisible by 5 or 7 but not divisible by 9?
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How many 3 digit numbers are divisible by 5 or 7 but not divisible by 9?
How many 3 digit numbers are divisible by 5 or 7 but not divisible by 9?
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Hello Kath010 here is the answer/explanation.
There are 999 3 digit numbers. Let's divide by 5 and 7.
We'll find 999/5=199 numbers divisible by 5
And 999/7= 142 numbers divisible by 7
Among these 142/5=28 numbers are divisible by both 5 and 7.
Total: 199+142–28 = 213 numbers
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