Which term of the AP 5 , 9 , 13 , 17 .. is 81
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Answered by
2
n = 20 by a=5&d=4 so, an = a+(n-1)d
Anonymous:
How u got 20
Answered by
26
Let a be the first term and d be the common difference.
Here, first term a = 5, Common difference d = 9 - 5 = 4, an = 81.
We know that nth term of an AP : an = a + (n - 1) * d
= > 81 = 5 + (n - 1) * 4
= > 81 = 5 + 4n - 4
= > 81 = 4n + 1
= > 80 = 4n
= > n = 20.
Therefore, the result is 20th term.
Hope this helps!
mark me as brainliest
Now when we are solving this should we ignore 5
5 stars from me to my @sid bhaiya
@vilokabest who ignores 5
Ok i got my answer
85 = 5+ 4n - 4....... (5-4 =1) 85 = 4n +1
Have a great Brainly journey ahead :-)
Thanks to all...
My pleasure bhaiya
:-)
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