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Question
Mathematics
n (n + 1)(2n + 1): n ∈ Z ⊂
Q.
{
n
(
n
+
1
)
(
2
n
+
1
)
:
n
∈
Z
}
⊂
2742
188
Principle of Mathematical Induction
Report Error
A
{
6
k
:
k
∈
Z
}
50%
B
{
12
k
:
k
∈
Z
}
26%
C
{
18
k
:
k
∈
Z
}
19%
D
{
24
k
:
k
∈
Z
}
5%
Solution:
Put n = 1,2 and verify the options.