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Maths Puzzle
shyam has to secure 40% marks to pass his B.tech final exams.He got just 40 marks and failed by 40-marks.What is the maximum marks ?
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In an Entrance examination, a multiple choice question has 5 options. If Rohit chooses the correct option, he earns 4 marks and for choosing the wrong option incurs negative marks. If Rohit chooses an option randomly, his expected score is 0. Suppose Rohit has successfully eliminated 3 incorrect options. What will be the expected score if he chooses randomly among the remaining options ?
Find the mistake in the below maths equations...
A = 2
A(A-1) = 2(A-1)
A2-A = 2A-2
A2-2A = A-2
A(A-2) = A-2
A = 1