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[" 10.Show that "a(1),a(2),...,a(n),..."...

[" 10.Show that "a_(1),a_(2),...,a_(n),..." form an AP where "a_(n)" is defined as below: "],[qquad " (i) "a_(n)=3+4n],[" Also find the sum of the first "15" terms in each case."]

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