SOLUTION: Find the middle term of the progression 4,9,14.... 104...

Algebra ->  Sequences-and-series -> SOLUTION: Find the middle term of the progression 4,9,14.... 104...      Log On


   

Question 1100176: Find the middle term of the progression 4,9,14.... 104...
Answer by josgarithmetic(39630) About Me  (Show Source):
You can put this solution on YOUR website!
4%2B5x=104
5x=100
x=20

The sequence has 21 terms. Middle term is at index 11.
4%2B%2811-1%295
4%2B10%2A5
highlight%2854%29


Also, %284%2B104%29%2F2=108%2F2=54, average of first and last terms of sequence.