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Question

Of the 25 questions in a unit, a student has worked out only 20. In a sessional test of that unit, two questions were asked by the teacher, The probability that the student can solve both the questions correctly, is

A
825
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B
1725
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C
910
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D
1930
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Solution

The correct option is D 1930
Total number of questions = 25
Student has worked out = 20
The probability that the student can solve both the questions correctly
=20C225C2
=1930

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