Problems with normal subgroups


Question:

Problems with normal subgroups

1. Let N1, ..., Nk be normal subgroups of a finite group G. If G = N1N2 ...Nk (the set of all elements of the form a1a2...ak with a j in N j) and |G| = |N1| . |N2| . |N3| ... |Nk|, prove that G = N1 x N2 x N3 x ... x Nk.

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Algebra: Problems with normal subgroups
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