Questions
If mth term of an A.P. is n and nth term in m, then its r th term is
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a
m + n – r
b
m + n + r
c
m – n + r
d
r – (m + n)
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Correct option is A
am=n,an=m⇒(m−n)d=an−an=−(m−n)⇒d=−1Now, ar−am=(r−m)(−1)⇒ar=am−r+m=m+n−rSimilar Questions
The sum of terms of an is The number of term which equals 159, is
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