单项选择题

If r and 8 are positive integers，each greater than 1，and if 11(s-1)=13(r-1)，what is the least possible value of r+s（）

A. 2
B. 11
C. 2
D. 24
E. 26

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单项选择题

What is the least prime number greater than 83？（）

A. 85
B. 87
C. 88
D. 89
E. 91

单项选择题

If p and r are prime numbers，which of the following must also be prime（）

A. pr
B. p+r
C. pr+1
D. p²+r²
E. None of the above

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