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08 Feb 2017, 15:52
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C
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If you multiply the number of integers between 1 and 100 whose digits sum to 9
by the number of integers between 1 and 100 that divide by 9, the product is
A. 90
B.100
C.110
D.121
by the number of integers between 1 and 100 that divide by 9, the product is
A. 90
B.100
C.110
D.121
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08 Feb 2017, 20:24
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gracie
If you multiply the number of integers between 1 and 100 whose digits sum to 9
by the number of integers between 1 and 100 that divide by 9, the product is
A. 90
B.100
C.110
D.121
by the number of integers between 1 and 100 that divide by 9, the product is
A. 90
B.100
C.110
D.121
Number of integers between 1 to 100 whose digits sum to 9 are first 10 multiple of 9 ie 9,18,27,36,45,54,63,72,81 = 10nos.
number of integers between 1 and 100 that divide by 9 are all multiples of 9 ie all 10nos. listed above & 99 =11nos. in total
thus their product= 10* 11 =110
Ans C
Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Problem Solving (PS) Forum
Still interested in this question? Check out the "Best Topics" block above for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
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