Number System
On a new year eve, every student of a class sends a card to every other student. If the total number of cards delivered is 1980, how many students are there in the class ?

45
43
47
41

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Number System
The sum of five consecutive odd numbers of set p is 435. What is the sum of five consecutive numbers of another set q. Whose largest number is 45 more than the largest number of set p?

670
530
730
770

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Number System
In how many different ways can be the letters of the word PENCIL be arranged among themselves ?

640
720
860
510

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