[問題] GWD &PP求解
GWD22 Q11求解 求解兩道數學,請高手幫忙解答,謝謝!
GWD22 Q11
In a stack of cards, 9 cards are blue and the rest are red. If 2 cards are to be chosen at random from the stack without replacement,
the probability that the cards chosen will both be blue is 6/11.What is the number of cards in the stack?
A.10 B.11 C.12 D.15 E.18
PP19
The sequence a1.a2....an.. is such that an=4an-1-3 for all intergers n>1. If a3=x, then a1=?
A.4X-3 B.16X-15 C.(X+3)/4 D.(X+3)/16 E.(X+15)/16
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