Ben and Ann are among 7 contestants fr...

What is the units digit of (13)⁴(17)²(29)³ ？（）

A．9
B．7
C．5
D．3
E．1

If a, b, and c are integers, is the number 3 (a+b)-c divisible by 3 ？（）
(1)a+b is divisible by 3.
(2)c is divisible by 3.

A．条件(1)充分，但条件(2)不充分．
B．条件(2)充分，但条件(1)不充分．
C．条件(1)和(2)单独都不充分，但条件(1)和条件(2)联合起来充分．
D．条件(1)充分，条件(2)也充分．
E．条件(1)和条件(2)单独都不充分，条件(1)和条件(2)联合起来也不充分．

Ben and Ann are among 7 contestants from which 4 semifinalists are to be selected. Of the different possible selections, how many contain neither Ben nor Ann ？（）

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i) if a is in S. then -a is in S, and
ii) if each of n and b is in S, then ab is in S. Is -4 in S（）
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Ⅰ 2k
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3.2□△6
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