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Sequence - 4 (Posted on 2006-03-23) Difficulty: 3 of 5
The number of terms of an Arithmetic Progression is even.

The sum of the terms in the odd places (First term + Third Term + Fifth Term + ...and so on) is 24;

The sum of the terms in the even places (Second Term + Fourth Term + Sixth Term + ... and so on) is 30; and

The last term exceeds the first by 21/2, then:

What is the arithmetic progression?

No Solution Yet Submitted by Ravi Raja    
Rating: 2.5000 (2 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
re(2): Solution | Comment 3 of 4 |
(In reply to re: Solution by Ady TZIDON)

I assume you meant (n-1)/n = 7/8, which would make the equation correct.  And I'm not sure what the "etc" means at the end of your post - the only things you can figure out from those equations are d = 1.5 and n = 8.

In fact, the only thing that you did to make my solution shorter is drop the last equation which tells where the sequence begins (something suspiciously absent from your "shorter" solution).  You still have to figure that out somehow.


  Posted by tomarken on 2006-03-23 11:59:40
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