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Question

For what value of n, are the nth terms of two APs : 63,65,67,... and 3,10,17,... equal

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Solution

63,65,67 3,10,17
a=63,d=z a=3,d=7
63+(n1)2=3+(n1)7
63+2n2=3+7n7
65=5n
n=13

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