which terms of the series 711+15+...... is 403?
Answers
Actually after thinking very hard I could figure out that your series is :
7 , 11 , 15 , ................................. 403
This is an AP or Arithmetic Progression .
Woah it took me 20 minutes to understand that anyways :
We take first term as a
The common difference is d.
a = 7
d = 11 - 7 = 4
or , 15 - 11 = 4
d = 4
Let 403 be the n th term .
We know that n th term of an AP is a + ( n - 1 ) d
==> a + ( n - 1 ) d = 403
==> 7 + ( n - 1 ) 4 = 403
==> (n - 1) 4 = 403 - 7
==> (n - 1)4 = 396
==> (n - 1) = 396 / 4
==> n - 1 = 99
==> n = 99 + 1
==> n = 100
The n th term is 403 .
100 th term is 403 .
The answer to your question is 100
Hope it helps you :-)
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