Sponsor Area
Permutations And Combinations
Question
If a, b, c are in A.P., prove that 
are also in A.P.
Solution
will be in A.P.if
if
or if 
if
if b - a = c - bif a, b, c are in A.P. which is true.
Hence,
are in A.P.
Some More Questions From Permutations and Combinations Chapter
Sponsor Area
Mock Test Series
Mock Test Series