[計量] PP數學問題詢問~
(1). n is multiple of 5, and n=p^2q, p and q are primes,
which of the following must be a multiple of 25?
1.p^2 2.q^2 3.pq 4.p^2q^2 5.p^3q
ans. 4
為何壓?????
(2). 四對結婚夫婦裡選三人出來參與委員會，
but two people who r married to each other cannot be both serve on the
committee, 問總共有幾種方法???
ans. 32種
請問怎麼算的啊??
(3). there r more than two numbers in a certain list, is each of the numbers
in the list equal to 0?
條件一 the product of any two numbers in the list is equal to 0
條件二 the sum of any two numbers in the list is equal to 0
我當初選D
可是答案只有B, 為什麼條件一不是呢???
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