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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: Solution | Comment 2 of 4 |
(In reply to Solution by tomarken)

shorter:

d(n-1) = 10.5
(dn)/2 = 6

 

divide one eq. by another:  n/(n-1)=7/8

       so n=8, d=1.5 etc


  Posted by Ady TZIDON on 2006-03-23 11:44:03
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