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Byju's Answer
Standard X
Mathematics
Sum of N Terms of an AP
In an arithme...
Question
In an arithmetic series,
a
1
=
−
14
and
a
5
=
50
. Find the sum of the first 5 terms.
A
60
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B
70
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C
80
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D
90
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Solution
The correct option is
A
90
First term = a = -14
last term, l = 50
a
n
=
50
n = 5
S
n
=
n
2
[
a
+
l
]
S
5
=
5
2
[
−
14
+
50
]
S
5
=
2.5
[
36
]
S
5
=
90
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