MBA Exam

If there are Six periods in each working day of a school, In how many ways can one arrange 5 subjects such that each subject is allowed at least one period?dnt knw the right answer!

1) 6^5
2) 6c5
3) 6!
4) 5!

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MBA Other Question

How many 6 digit numbers contain exactly 4 different digits ?Plz post your approach..

1) 294840
2) 342422
3) 123421
4) 223344
If f1(x) = 1/(1+x) and fn(x) = 1/(1+fn-1(x)), then find the approximate value of f100(1).

1) 0.62
2) 0.69
3) 0.52
4) 0.59