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Let A equal the number of four digit odd numbers. Let B equal the number of four digit multiples of 7. Find  A + B.

 Oct 30, 2020
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Between 1,000 and 9,999 =9,000 four-digit numbers.

 

A =9,000 / 2 = 4,500 Odd numbers.

B =9,000 / 7 =1,286 multiples of 7

 

[A + B] = [4,500 + 1,286] =5,786

 Oct 30, 2020

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