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01 Sep 2007, 08:39
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Please, let know your answer and calculations...
Answer choices are:
20
25
100
150
200
Answer choices are:
20
25
100
150
200
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I got 100:
Let's look on 200-300:
20* - we have 5 odd numbers there: 201, 203, 205, 207, 209
22* - again 5 odd
24* - again 5 odd
26* - again 5 odd
28* - again 5 odd
For this range we have 25 such numbers, right?
We have 4 group of ranges: 200, 300, 400, 500
So 25*4 = 100.
Actually this can be done faster:
600-200 = 401 int.
401/2 = 200 odd int.
200/2 = 100 odd int with even tenth digit
Let's look on 200-300:
20* - we have 5 odd numbers there: 201, 203, 205, 207, 209
22* - again 5 odd
24* - again 5 odd
26* - again 5 odd
28* - again 5 odd
For this range we have 25 such numbers, right?
We have 4 group of ranges: 200, 300, 400, 500
So 25*4 = 100.
Actually this can be done faster:
600-200 = 401 int.
401/2 = 200 odd int.
200/2 = 100 odd int with even tenth digit
01 Sep 2007, 09:09
Kudos
Bookmarks
Whatever
Right, totally agree.
My mistake was that I did not consider zero as an even intenger.
Zero is non negtive non positve, even intenger. I have to memorize this.
Thank you.
