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Question
How many natural numbers between 1 and 900 are NOT multiples of any of the numbers 2, 3, or 5?
How many natural numbers between 1 and 900 are NOT multiples of any of the numbers 2, 3, or 5?
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Solution
The correct option is A 240
Note: This is based on the concept of Euler’s number
A number N can be written asambn. In this case, 
The question can be rephrased as
The number of natural numbers which are less than 900 and relatively prime to it is
Note: This is based on the concept of Euler’s number
A number N can be written asambn. In this case,
The question can be rephrased as
The number of natural numbers which are less than 900 and relatively prime to it is
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