CBSE 10th Class past year question paper
Year 2019
SET 1, Code Number- 30/2/1
Question number – 3
Find the common difference of the Arithmetic Progression (A.P.) 1/a ,(3-a)/3a ,(3-2a)/3a ,…….(a≠0)
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= { ( 3 – a ) / 3a } – 1/a
= ( 3 – a – 3 ) / 3a
= -1/3