单项选择题

S is the sum of the first n negative integer powers of 2, i.e., S=2^-1+2^-2+ ... +2^-n.（）

A. if Quantity A is greater;
B. if Quantity B is greater;
C. if the two quantities are equal;
D. if you cannot determine the relationship based on the given information.

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单项选择题

（）

A. if Quantity A is greater;
B. if Quantity B is greater;
C. if the two quantities are equal;
D. if you cannot determine the relationship based on the given information.

单项选择题

How many positive 4-digit integers begin (on the left) with an odd digit and end with an even digit

A. 250
B. 500
C. 2,000
D. 2,500
E. 5,000

S is the sum of the first n negative integer powers of 2, i.e., S=2-1+2-2+ ... +2-n.（）

S is the sum of the first n negative integer powers of 2, i.e., S=2^-1+2^-2+ ... +2^-n.（）