英语和数学好的人进!For A={1,2,3,4} and B={a,b,c,d}, give an example o

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英语和数学好的人进!
For A={1,2,3,4} and B={a,b,c,d}, give an example of each of the following:
a. a function from A to B that is not one-to-one.
b. a relation on A that is reflexive but not transitive.
c. a relation from A to B that is not a function from A to B.

a
1->a, 2->a, 3->a, 4->a
b
R={(1,1),(2,2),(3,3),(4,4),(1,2),(2,3)}
tip: (1,3) is not in R
c
R={(1,a)}
再问：大神，帮忙看下这些题能不能一起解下！万分感激，我会追加悬赏的，多谢啦！

不好意思，题有点多，做不出来也没关系啦~

This is ____ only example I can give you.A./ B.an C.one D.th Give him an inch ______he 'll take an ell.A.so B.and C.or D. An=a*An-1+b*An-2+c*An-3+d*An-4 已知了前面几项的值,能不能利用eviews把abcd求出来 =4,b=3,c=2,d=1下列表达式的值是a大于b+1 or c小于d and b mod c a = 3:b = 4:c = 5 d = a > b And b < c And a < c Or a \ b = c Here take English learning ( )example A.with B.as C.for D.to 英语翻译For example(instance),......such as A,B,C and so on (so /a-2/+/b-3/+/c-4/=o 计算a+2b+3c的值英语xuan zKelsey has___dinner at 6 o'clock.A.a B./ C.an D.theW played and sang'Happy birthday'____Tom.A.to B.for C.with D.o 已知|a-2|+|b-3|+|C-4|=O （1）求a ,b ,c 的值（2）计算2|a|+3|-b|+4|C| 3a-2b+c=0 12a+4b+c=0 -a+b-c+d=0 8a+4d+2c+d=0求a.b.c.d的值,