1.Malcolm wants to visit Isabella after school today and knows the street where she lives but doesn't know her house number.She tells him,“My house number has two digits,and exactly three of the following four statements about it are true.”(1)It is prime.
(2)It is even.
(3)It is divisible by 7.
(4)One of its digits is 9.
This information allows Malcolm to determine Isabella's house number.What is its units digit?( ?。?br />Malcolm今天放學后想去拜訪Isabella,他知道她住在哪條街,但不知道她的門牌號碼。她告訴他:“我的門牌號有兩位數(shù),以下四個陳述中有三個是正確的?!?br />(1)它是一個質(zhì)數(shù)。
(2)它是偶數(shù)。
(3)它可以被7整除。
(4)它的其中一個數(shù)字是9。
這些信息使Malcolm能夠確定Isabella的門牌號碼。它的個位數(shù)字是多少?( ?。?/div>
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