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Byju's Answer
Standard XII
Mathematics
nCr Definitions and Properties
∑ n =55 n=5
Question
∑
n
=
55
⟹
n
=
5
A
True
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B
False
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Solution
The correct option is
B
False
∑
n
=
55
n
(
n
+
1
)
2
=
55
n
2
+
n
=
110
n
2
+
11
n
−
10
n
−
110
=
0
n
(
n
+
11
)
−
10
(
n
+
11
)
=
0
(
n
−
10
)
(
n
+
11
)
=
0
n
=
10
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Let
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be the unary negation (NOT) operator, with higher precedence, than
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