[數學] 兩題來欣M6的數學題
1. Which of the following CANNOT yield an integer when divided by 10?
(A) The sum of two odd integers
(B) An integer less than 10
(C) The product of two primes
(D) The sum of three consecutive integers
(E) An odd integer
答案是(E)
我用刪去法到最後剩下(B)跟(E)，可是想不出來為什麼最後要選(E)
2. A certain clock marks every hour by striking a number of times equal to
the hour, and the time required for a stroke is exactly equal to the time
interval between strokes. At 6:00 the time lapse between the beginning of
the first stroke and the end of the last stroke is 22 seconds. At 12:00,
how many seconds elapse between the beginning of the first stroke and the
end of the last stroke?
答案是46秒
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