[計量] 數學難題 請教高手
Let p and q be distinct primes.
Suppose that H is a proper subset of the integers
and H is a group under addition that contains exactly three elements
of the set{p, p+q, pq, p的q次方, q的p次方}
(因為次方我不會打 所以才用中文代替)
Determine which of the following are the three elements in H.
a. pq, p的q次方, q的p次方
b. p+q, pq, p的q次方
c. p, p+q, pq
d. p, p的q次方, q的p次方
e. p, pq, p的q次方
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