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Permutation-and-Combination

What is value of 1 × 1! + 2 × 2! + 3 × 3! + . . . . . . . . n × n!
where n! means n factorial or n(n-1) (n-2) . . . . . . . . 1


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This Chapter Permutation-and-Combination consists of the following topics

In how many ways can 5 different toys be packed in 3 identical boxes such that no box is empty, if any of the boxes may hold all of the toys?

What is value of 1 × 1! + 2 × 2! + 3 × 3! + . . . . . . . . n × n!
where n! means n factorial or n(n-1) (n-2) . . . . . . . . 1

When six fair coins are tossed simultaneously, in how many of the outcomes will at most three of the coins turn up as heads?

What is the value of 1 × 1! + 2 × 2! + 3 × 3! + . . . . . . . . n × n!<br /> where n! means n factorial or n(n-1) (n-2) . . . . . . . . 1

Permutation and Combination

Arithmetic-Aptitude