If a, b, c are in A. P. then show that b + c, c + a, a + b are also also A. P
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according to the question
2b=a+c
and in 2nd part
2(c+a)=b+c+a+b
2c+2a=2b+c+a
c+a=2b.
so it also form A.P
2b=a+c
and in 2nd part
2(c+a)=b+c+a+b
2c+2a=2b+c+a
c+a=2b.
so it also form A.P
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