We have been a series of AP 5, 4 1/2, 4, 3 1/2,3,….and we asked to find the 25th term of this series.
Book – RS AGGARWAL,
class 10, Arithmetic Progression, chapter 5A, question no 3(ii)
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Here, first term =a=5
Common difference:
d=4 1/2−5=−1/2
nth term is given by,
an=a+(n−1)d
Put n=25
a25=5+(25−1)(−1/2)
=−7.