Exam Maths Puzzle Numerical Ability Complex Numbers

4,36,144,400,__

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Exam Other Question

The question paper contains 5 questions. Question no. 1 has no choice but
question no. 2 to 5 each having an internal choice. In how many ways can an examinee
answer all the 5 questions?
A is 40 % more efficient than B and B is 20 % less efficient than C. If A takes 6 days less than C to complete a work, then in how many days will B complete
this work ?