Question

Mauricio counts from 1 to 200. Believing that 7 not a lucky number for him,he skips all the multiples of 7 and all the numbers that contain digit 7. In this situation how many numbers does he skip?

Answer 1

Hey There!

Here is your answer.

Mauricio skipped all the multiples of seven so let's see the multiples of seven.
They are 7,14,21,28,35,42,49,56,63,70,77,84,91,98,105,112,119,126,133,140,147,154,161,168,175,182,189,196 are the multiples of seven between one to hundred .
Now we count them then we find they are 28 in numbers so he skipped 28 numbers from his counts.



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Answer 2

The numbers he would skip are 7,14,17,21,27,28,35,37,42,47,49,56,57,63,67,70,71,72,73,74,75,76,77,78,79,84,87,91,97,98,105,107,112,117,119,126,127,133,137,140,147,154,157,161,167,168,170,171,172,173,174,175,176,177,178,179,182,187,189,196,197.


Therefore, total numbers which he skips =61

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