find the sum of 5+17+29+41+........ upto 20th term
Answers
Answered by
2
Answer:
2380
Step-by-step explanation:
d=12
sum of first n terms = n{2a+(n-1)d}/2
Sum of first 20 terms= 20(2×5+(20-1)12)/2
10× (10+228)
= 2380
Answered by
1
Answer:
2280
Step-by-step explanation:
By using the formula of sum of ap
tn=a(2n-1)d
The value of
a=5
d=12
n=20
By putting the values in the given formula
tn=5(2(20-1)12
tn=5(2(19)12
tn=2280
Therefore the sum of the given ap is 2280
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