Exam Maths Puzzle Numerical Ability

In an examination of 100 objective question, with 4 multiple choices of answers for each.Each correct answer carries 1 mark and there is no negative marking. If a student doesn't know answer for any of the question but randomly select any answer attempting all the questions.What is the probability that he gets 80 marks?

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Exam Other Question

/(³√4+³√2+1) is equal to..??
1. ³√2-1
2. ³√2+1
3. -³√2-1
4. 1-³√2
If BASKET is coded 116, then how will COLOUR be coded