单项选择题

A linen shop has a certain tablecloth that is available in 8 sizes and 10 colors．What is the maximum possible number of different combinations of size and color available（）

A. 9
B. 18
C. 40
D. 80
E. 90

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单项选择题

What is the total number of different 5-digitnumbers that contain all of the digits 2，3，4，7 and 9 and in which none of the odd digits occur next to each other（）

A. 12
B. 10
C. 8
D. 6
E. 1

单项选择题

For which of the following sets of numbers is the product of the three numbers less than each member of the set（）

A.a
B.b
C.c
D.d
E.e

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