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Question

Find the common difference of the A.P.: 1.,2.0,2.2,2.4,.....

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Solution

Given A.P is,
1.8,2.0,2.2,2.4,...
first term of this A.P is a1=1.8
second term of this A.P is a2=2.0
third term of this A.P is a3=2.2
fourth term of this A.P is a4=2.4
common difference of an A.P is (i.e.,d=an+1an)
putting n=1 in above equation
d=a2a1=2.01.8=0.2
hence,
common difference d=0.2


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