本人剛開始準備GMAT....早上上課時老師講太快...聽不太懂...
又不敢跑去問老師...可請大家幫忙解惑一下嗎??
Q12.If an integer is randomly selected from all positive 2-digit integers (i.e.,the integer 10,11,12,...99),what is the probability that the integer chosen has
(a)a "4" in the tens place? Ans.1/9
Q13.in a box of 10 electrical parts,2 are defective
(b) If two parts are chosen randomly from the box, what us the probability that both are defective? Ans.1/45
為何咧??可以解釋給我聽嗎??拜託了....感激感激!!
