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Question

Find the common difference of the A.P.: 119,136,153,170,.....

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Solution

Given A.P is,
119,136,153,170,...
first term of this A.P is a1=119
second term of this A.P is a2=136
third term of this A.P is a3=153
fourth term of this A.P is a4=170
common difference of an A.P is (i.e.,d=an+1an)
putting n=1 in above equation
d=a2a1=136119=17
hence,
common difference d=17


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