从集合{1,2,3,...,n}到集合{0,1}有多少满足如下条件的函数?其中n是正整数
a) 是一对一的函数有多少?
b) 1 和n的象是0的函数有多少?
c) 小于n的正整数恰有一个的象是1这样有函数有多少?
解从集合{1,2,3,...,n}到集合{0,1}有2^n个函数
a) 没有一对一的
b) 2^(n-2)
c) 2(n-1)
英语翻译
英语翻译
How many functions are there from the set {1,2,3,...,n},where n is a positive integer,to the set {0,1}
a) that are one-to-one?
b) that assign 0 to both 1 and
c) that assign 1 to exactly one of the positive integers less than
主要是b和c看不懂assign to both...excactly
How many functions are there from the set {1,2,3,...,n},where n is a positive integer,to the set {0,1}
a) that are one-to-one?
b) that assign 0 to both 1 and
c) that assign 1 to exactly one of the positive integers less than
主要是b和c看不懂assign to both...excactly
数学人气:569 ℃时间:2019-09-22 02:46:59
优质解答
我来回答
类似推荐
猜你喜欢
- 1在△ABC中,AB=2,BC=1.5,∠ABC=120°,若使该三角形绕直线BC旋转一周,则所形成的几何体的体积是( ) A.32π B.52π C.72π D.92π
- 2请问,有没有六年级水平的英语端午节介绍?
- 3氯化钠,氯化镁,氯化铝和氯化硅的离子极化作用最强的是?
- 4三个专心读书的词语
- 5英语近义词,见下:
- 6把一根4m长的圆木锯成4段短圆木,表面积比原来增加了48dm,这根圆木原来的体积是多少?
- 7一辆汽车,发动机的功率是70千瓦,半小时内在 平直公路上匀速行驶了40千米.问发动机的牵引力做了多少功?
- 8--Will you see him tomorrow? --I will ____(see) him at 10 o'clock tomorrow morning.
- 9高一英语作文.100词左右,
- 10两个一元二次方程x²+kx-1=0与x²+x+k-2=0有且仅有一个相同的实数根,求k的值