Transcription of PERMUTATIONS AND COMBINA TIONS - NCERT
{{id}} {{{paragraph}}}
Example: stock market
PERMUTATIONS AND COMBINA TIONS - NCERT
Every body of discovery is mathematical in form because there is noother guidance we can have DARWIN IntroductionSuppose you have a suitcase with a number lock. The numberlock has 4 wheels each labelled with 10 digits from 0 to lock can be opened if 4 specific digits are arranged in aparticular sequence with no repetition. Some how, you haveforgotten this specific sequence of digits. You remember onlythe first digit which is 7. In order to open the lock, how manysequences of 3-digits you may have to check with? To answerthis question, you may, immediately, start listing all possiblearrangements of 9 remaining digits taken 3 at a time. But,this method will be tedious, because the number of possiblesequences may be large. Here, in this Chapter, we shall learnsome basic counting techniques which will enable us to answer this question withoutactually listing 3-digit arrangements.
PERMUTATIONS AND COMBINATIONS 139 Definition 1 A permutation is an arrangement in a definite order of a number of objects taken some or all at a time. In the following sub Section, we shall obtain the formula needed to answer these questions immediately. 7.3.1 Permutations when all the objects are distinct
Loading..
Tags:
Information
Domain:
Source:
Link to this page:
Please notify us if you found a problem with this document: