the first term of an AP is 5,the last term is 45 and the sum is 400 find the number of terms in the AP
Answers
Answered by
6
Answer:
Values of n = 16 and
Values of n = 16 and d = 8/3
Step-by-step explanation:
Let a , d , l are first term , common difference and last term of an A.P , respectively.
given ,
a = 5, l = 45
We know that,
Substitute values of a and l , we get,
=> 45 = 5+(n-1)d
=> 45-5 = (n-1)d
=> (n-1)d=40 ----(1)
\* given *\
Now ,
Substitute n=16 in equation (1), we get
(16-1)d = 40
=> 15d =40
=> d = 40/15
=> d = 8/3
Therefore,
Values of n = 16 and
d = 8/3
Step-by-step explanation:
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Answered by
3
Answer:
16
Step-by-step explanation:
Now ,
Substitute n=16 in equation (1), we get
(16-1)d = 40
=> 15d =40
=> d = 40/15
=> d = 8/3
Therefore,
Values of n = 16 and
d = 8/3
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