find the sum of first 10 terms of the sequence 10,8,6,....
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Answer:
420 ekndndbwjkxnfnfn
Step-by-step explanation:
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Step-by-step explanation:
Answer
Correct option is
D
100
The sum of first n terms of arithmetic series formula can be written as,
S
n
=
2
n
[2a+(n−1)d]
Where n = number of terms ⇒10
a= first term ⇒1
d= common difference of A.P. ⇒2
Apply the given data in the formula,
S
10
=
2
10
[2×1+(10−1)2]
=5[2+18]
=5[20]
=100
So, the sum of first 10 of the A.P. is 100.
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