请问How do you turn an odd number into even by removing one letter?这个数字是几?

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请问How do you turn an odd number into even by removing one letter?这个数字是几?

seven ,数字7,它是基数,并且去掉s后就是even

seven ,数字7,它是奇数(odd number),去掉(remove one letter)s后,就是even