Lê Quốc Trần Anh Coordinator
11/01/2018 at 09:46
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From 1 to 2001 :
The number of multiples of 3 is : (2001 - 3) : 3 + 1 = 667
The number of multiples of 4 is : (2000 - 4) : 4 + 1 = 500
The number of common multiples of 3 and 5 is :
(1995 - 15) : 15 + 1 = 133
The number of common multiples of 4 and 5 is :
(2000 - 20) : 20 + 1 = 100
The number of common multiples of 3 and 4 is :
(1992 - 12) : 12 + 1 = 166
The number of common multiples of 3, 4 and 5 is :
(1980 - 60) : 60 + 1 = 33
The answer is :
(667 - 133) + (500 - 166 - 100 + 33) = 801
Lê Quốc Trần Anh selected this answer.
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FA Liên Quân Garena 12/01/2018 at 12:26From 1 to 2001 :
The number of multiples of 3 is : (2001 - 3) : 3 + 1 = 667
The number of multiples of 4 is : (2000 - 4) : 4 + 1 = 500
The number of common multiples of 3 and 5 is :
(1995 - 15) : 15 + 1 = 133
The number of common multiples of 4 and 5 is :
(2000 - 20) : 20 + 1 = 100
The number of common multiples of 3 and 4 is :
(1992 - 12) : 12 + 1 = 166
The number of common multiples of 3, 4 and 5 is :
(1980 - 60) : 60 + 1 = 33
The answer is :
(667 - 133) + (500 - 166 - 100 + 33) = 801