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If cos x = tan y, cot y = tan z and cot z = tan x , then sin x is equal to

1)  2) 3)  4)   

The least positive remainder, when 123 × 125 × 127 is divided by 124 is

1) 4

2) 120

3) 121

4) 130  

A four - digit number is formed by the digits 1, 2, 3, 4 with no repetition. The probability that the number is odd, is

1) Zero 2) 1/3 3) 1/4 4) None of these