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Bunuel
How many of the positive integers less than 10,000 are divisible by 3 or 5?

A. 4,666
B. 4,667
C. 5,132
D. 5,133
E. 5,332

Are You Up For the Challenge: 700 Level Questions

Asked: How many of the positive integers less than 10,000 are divisible by 3 or 5?

Numbers divisible by 3 = {3,6,....9999} = 3333
Numbers divisible by 5 = {5,10,,,,9995} = 1999
Numbers divisible by 3*5 = 15 = {15,30,.....9990} = 666

Number of the positive integers less than 10,000 are divisible by 3 or 5 = 3333 + 1999 - 666 = 4666

IMO A
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The terms which are divisible by 3 - 3,6,9,12....,9999. Total=3333 (I have used the formula of AP).
The terms which are divisible by 5 - 5,10,15,20....,9995. Total=1999.
The terms which are divisible by 15 - 15,30,45,60....9990. Total=666.
Therefore, total terms 3333+1999-666=4666(A).
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