Posted by **Eryea** on Sunday, January 24, 2010 at 12:10am.

Find the sum of the 25th term to 50th term of the arithmetic progression 28,23,18, ...

- arithmetic -
**Reiny**, Sunday, January 24, 2010 at 8:56am
You have an AS where a=28 and d= -5

Find the sum of the first 50 terms using your formula, and then the sum of the first 24 terms.

Subtract the two.

(you should get 7525 - 2052 = 5473 )

- arithmetic -
**Andy**, Wednesday, April 14, 2010 at 2:47pm
The progression lists stops on the downtown 1 train in New York. The next number in the sequence is 14, but that's the last numeric stop.

Try a real New York high school exam question: Complete the progression:

4,14,34,42,blank, blank.

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