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N * (n-1 ) / 2
No of homo from the group zm to the group zn is gcd(m,n) No of homo from the ring zm to the ring zn is 2^(w(n)-w(n/gcd(m,n)))
n + 7 = 4*6 n + 7 = 24 n = 24 - 7 = 17.
In abstract algebra, a generating set of a group is a subset of that group. In that subset, every element of the group can be expressed as the combination (under the group operation) of finitely many elements of the subset and their inverses.
Given a set of n scores, the variance is sum of the squared deviation divided by n or n-1. We divide by n for the population and n-1 for the sample.