For what value of n are the nth terms of two APs 63 65 67 and 3 1017 equal Mathematics CBSE class 10 2017

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For what value of n, are the nth terms of two A.Ps 63, 65, 67,.... and 3, 10,17,..... equal? Mathematics CBSE class 10 2017

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


By:tarun101

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In first AP
a=63,d=2
nth term=63+(n-1)2=63+2n-2=2n+61
In second AP
a=3,d=7
nth term=3+(n-1)7=3+7n-7=7n-4
7n-4=2n+61
5n=65
n=65/5=13
thus, n=13

akialwayz

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