I have a confusion in a problem of series .
- Raiyan Jamil
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In this series , a group of (1,2,3,.............400) is made . In it , some numbers are to be removed such that , a new series is made and in that series , the sum of any two numbers won't be divisible by 7 . What is the maximum number of numbers in that series .
- asif e elahi
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Re: I have a confusion in a problem of series .
I think the answer is $217$.
- Fatin Farhan
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Re: I have a confusion in a problem of series .
I think the ans is $$170$$
Last edited by Fatin Farhan on Sat Feb 08, 2014 8:59 am, edited 2 times in total.
"The box said 'Requires Windows XP or better'. So I installed L$$i$$nux...:p"
- Fatin Farhan
- Posts:75
- Joined:Sun Mar 17, 2013 5:19 pm
- Location:Kushtia,Bangladesh.
- Contact:
Re: I have a confusion in a problem of series .
$$1+57+56+56= 170$$
"The box said 'Requires Windows XP or better'. So I installed L$$i$$nux...:p"
Re: I have a confusion in a problem of series .
Hi everyone. Please practise posting full solutions/hints. Otherwise it will be no help to the person posting.
Yes, the solution is $170$. Here's why-
Yes, the solution is $170$. Here's why-
Please Install $L^AT_EX$ fonts in your PC for better looking equations,
Learn how to write equations, and don't forget to read Forum Guide and Rules.
"When you have eliminated the impossible, whatever remains, however improbable, must be the truth." - Sherlock Holmes
Learn how to write equations, and don't forget to read Forum Guide and Rules.
"When you have eliminated the impossible, whatever remains, however improbable, must be the truth." - Sherlock Holmes