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a,b,c AP-তে থাকলে প্রমাণ করুন যে b+c,c+a...

a,b,c AP-তে থাকলে প্রমাণ করুন যে `b+c,c+a,a+b`ও AP-তে আছে

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If a,b,c are in A.P. then

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