The first term of Ap is 5. Last term is 45 and
the sum is 400. find number of terms and
common difference.
Answers
Answered by
5
Answer:
n=16,d=8/3
Step-by-step explanation:
Hii mate there is ur answer:
Given, a1=5, l=45, Sn=400
Sn=n/2(a1+l)
=)400=n/2(5+45)
=)400=n*50/2
=)400=25n
=)n=16
now, l=a1+(n-1)d
=)45=5+(16-1)d
=)40=15d
=)d=8/3
Hope it will help you
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