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Permutation-and-Combination

After every get-toger every person present shakes hand of every or person. If re were 105 handshakes in all, how many persons were present in party?


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

In an examination paper, there are two groups each containing 4 questions. A candidate is required to attempt 5 questions but not more than 3 questions from any group. In how many ways can 5 questions be selected?

After every get-toger every person present shakes hand of every or person. If re were 105 handshakes in all, how many persons were present in party?

How many diagonals can be drawn in a pentagon?

After every get-together every person present shakes the hand of every other person. If there were 105 handshakes in all

how many persons were present in the party?

Permutation and Combination

Arithmetic-Aptitude