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+1 vote
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in Mathematics by (150k points)

Which term of the AP, 3,10,17 will be 84 more than its 13th term?
 

1 Answer

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Best answer

Let the nth term be 84 more than the 13th term.
Now a/q,
a=3, d=10-3=7
So, 13th term= a+12d =3+12x7=87
Then nth term=84+87=171
171=a + (n-1)d
171=3 + (n-1)x7
171-3/7+1=n
168/7+1=n
24+1=25=n

Therefore 25th term of the ap will be 84 more than 13th term

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