CBSE Class 11-science Answered
If the coefficients of
terms of
are in arithmetic progression, then find the value of r:
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
Expert Answer
Since the terms of given expansion are in arithmetic progression, we have,
or (15-2r) (r +1) = (13-2r) (15 –r)
or 15r + 15 - - 2r = 195 – 30r -13r +
or - 56r + 180 = 0
or - 4r + 45 = 0
or (r - 5) (r- 9) = 0
r = 5, 9.
Answered by | 04 Jun, 2014, 03:23: PM
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