Number System
The difference between the two digit number and the number obtained by interchanging its digits is 54. The difference between the digits is?

4
6
1
Nothing can be said.

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Number System
A bag contains four red, six black and seven green balls. Three balls are drawn randomly. What is the probability that the balls drawn contain exactly two red balls ?

58/340
39/340
45/340
51/340

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