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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