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Question

Find the common difference the following A.P
1,4,7,10,13,16,..

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Solution

Given series is 1,4,7,10,13,16,.......

Common difference can be found out as : c.d.=a2a1=a3a2=a4a3=...

Let's check, therefore,

a2a1=

41=3
Also,

a3a2=

74=3

And,

a4a3=

107=3
common difference (d)=3

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