Find the middle term of the AP 20,16,12,......-176

  1. profile image46
    harshini123posted 6 years ago

    Find the middle term of the AP 20,16,12,......-176

  2. stanwshura profile image75
    stanwshuraposted 6 years ago

    -78:

    (20-?=-176); ?= 196
    196/2=98
    20-98= -78 and -176+98=-78

  3. profile image0
    calculus-geometryposted 6 years ago

    for any arithmetic series -- one in which successive terms differ by a constant amount -- you can find the middle term by averaging the first and last terms.  This example is an arithmetic series because the difference between consecutive terms is 4

    so...

    [20 + (-176)]/2 = -156/2 = -78

 
working