the first term of an A.P is 5the last term is 45 and the sum of all its term is 400 find the number of term and the common difference of the A.P
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1
Answer:16
Step-by-step explanation:400=n/2(5+45)
n/2×50 = 400
25n=400
n = 16
Therefore number of terms =16
mohitsardar111:
D is not there
That is not important
Because Sn = n/2×(a+l) where a is first term and l is last term
Answered by
3
Answer:n=16
D=8/3
Step-by-step explanation:
Solution is below
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