Question

50

Step 1

From the given information, it is needed to prove or disprove that H is a subgroup of Z:

Step 2

A number n € Z is divisible by both 8 and 10 if and only if it is divisible by lcm (8,10) = 40 that is:

Step 3

Now, to prove that <40> is a subgroup of Z.

To show it is a ...

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