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Topology

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Moderate

How Many Normal Subgroups?

TOPO-XY51XG

How many normal subgroups does $\mathbb Z/2\mathbb Z*\mathbb Z/2\mathbb Z=\langle a,b\mid a^2=b^2=1\rangle$ have?

A

$2$

B

$3$

C

$4$

D

$5$

E

infinitely many