Since 121 is the square of a prime, there are only two distinct isomorphic groups.
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10 = 2*5, a product of 2 primes, and 2 divides (5-1). So there are only two groups.
If the set is of finite order, that is, it has a finite number of elements, n, then the number of subsets is 2n.
Yes, you divide the number of expected outcomes by the number of possible outcomes in order to determine probability.
No. As long as there are more than two, the number's composite.
In order to determine the number of significant figures in a number, you need to look at the non-zero digits and any zeros between them.