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Question

If a, b, c are in A.P., prove that the following are also in A.P.
1(b)+(c),1(c)+(a),1(a)+(b).

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Solution

1(c)+(a)1(b)+(c)=1(a)+(b)1(c)+(a)
or ba(b)+(c)=cb(a)+(b)
or ba=cb or 2b=a+c
therefore, a,b,c are in A.P

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