The sum of the first terms of an arithmetic sequence is Sn=bn-2n2. Find b if the tenth term is -16.
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Answer:
Correct option is
B
120
The sum of n terms of arithmetic sequence can be calculated by the formula
S
n
=
2
n
(a
1
+a
n
)Sn=n2(a1+an)
is the first term and the last term.n=10
First term =2
Tenth term =22
∴S
n
=
2
10
(22+2)
∴S
n
=10(12)=120
Step-by-step explanation:
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