Q. 134.2( 12 Votes )

# For what va

Answer :

We have to find the value of n, so that the nth term in the both series should be equal

63, 65, 67, ….

In the above series

First term (a1) = 63,

Common difference (d1) = 2

3, 10, 17, ….

First term (a2) = 3,

Common difference (d2) = 7

Since value of nth term is equal we equate an of both the series.

an1 = an2

a1 + (n-1)d1 = a2 + (n-1)d2

63 + (n-1)2 = 3 + (n-1)7

61 +2n = 7n – 4

5n = 65

n = 13.

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