if the 7 and 13 term of an arthimetic progression are 34 and 64 respectively then the common difference is
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a7 =34
a13 =64
a+6d =34
a +12d =64
-6d =-30
d =5
a13 =64
a+6d =34
a +12d =64
-6d =-30
d =5
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