# Question: number abampcplease establish the following assertions athe group z15 is...

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Number a,b&c,please!!

Establish the following assertions:

a)The group Z15 is the internal direct product of {0,5,10} and {0,3,6,9,12}.

b)The group Gs of symmetries of the square is indecomposable .

c)The additive groups Z and Q are both indecomposable.