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How many integers are there between 2 x 10^5 and 9 X 10^5 so that the
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22 Sep 2021, 05:29
22 Sep 2021, 05:29
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17% (00:59) wrong based on 17 sessions
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How many integers are there between \(2 * 10^5\) and \(9 * 10^5\) so that the sum of their digits is 3?
a) 9
b) 8
c) 7
d) 6
e) 5
a) 9
b) 8
c) 7
d) 6
e) 5
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Re: How many integers are there between 2 x 10^5 and 9 X 10^5 so that the
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22 Sep 2021, 05:37
22 Sep 2021, 05:37
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Carcass wrote:
How many integers are there between \(2 * 10^5\) and \(9 * 10^5\) so that the sum of their digits is 3?
a) 9
b) 8
c) 7
d) 6
e) 5
a) 9
b) 8
c) 7
d) 6
e) 5
When we check the answer choices (ALWAYS check the answer choices before choosing an approach), we see that all 5 answer choices a small.
In this case, we should consider the straightforward approach of listing and counting
2 x 10^5 = 2 x 100,000 = 200,000
9 x 10^5 = 9 x 100,000 = 900,000
So, we're must consider values between 200,000 and 900,000
The first value whose digits add to 3 is: 200,001
The next one is: 200,010
And: 200,100
201,000
210,000
And there's one more: 300,000
TOTAL = 6
Answer: D
gmatclubot
Re: How many integers are there between 2 x 10^5 and 9 X 10^5 so that the [#permalink]
22 Sep 2021, 05:37
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