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Mathematics > Permutations and Combinations > Learn Permutations

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Answered on 22/11/2016 Learn Permutations +2 Mathematics

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If 1/6 ! + 1/7 ! = x / 8 !, find x?

Sarvajeet Kumar

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Answered on 21/11/2016 Learn Permutations +2 Mathematics

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A coin is tossed 3 times and the outcomes are recorded. How many possible outcomes are there?

Eti Goyal

Mathematics is not about numbers, equation, computation, or algorithms it is about UNDERISTANDING.

Out come possible are 8:(HHH,HHT,HTH,THH,HTT,THT,TTH,TTT)
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Answered on 21/11/2016 Learn Permutations +2 Mathematics

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How many 5 - digit telephone numbers can be constructed using the digits 0 to 9 if each number starts...
How many 5 - digit telephone numbers can be constructed using the digits 0 to 9 if each number starts with 67 and no digit appears more than once?

Eti Goyal

Mathematics is not about numbers, equation, computation, or algorithms it is about UNDERISTANDING.

Total 5 digits telephone number is (if no digit appears more than once) = 8*7*6=336
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Answered on 01/12/2016 Learn Permutations +2 Mathematics

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How many 3 - digit numbers can be formed from the digits 1, 2, 3, 4, 6 assuming that repetition is not allowed?

Saurabh Ashok Pugaliya

Maths Cracker

60 digit we can make (5*4*3).
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Answered on 02/12/2016 Learn Permutations +2 Mathematics

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Define permutation?

Kovendan

In mathematics, the notion of permutation relates to the act of arranging all the members of a set into some sequence or order, or if the set is already ordered, rearranging (reordering) its elements, a process called permuting. These differ from combinations, which are selections of some members of... read more
In mathematics, the notion of permutation relates to the act of arranging all the members of a set into some sequence or order, or if the set is already ordered, rearranging (reordering) its elements, a process called permuting. These differ from combinations, which are selections of some members of a set where order is disregarded. For example, written as tuples, there are six permutations of the set {1,2,3}, namely: (1,2,3), (1,3,2), (2,1,3), (2,3,1), (3,1,2), and (3,2,1). These are all the possible orderings of this three element set. read less
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Answered on 21/11/2016 Learn Permutations +2 Mathematics

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How many words can be formed without repeating the words from the word MONDAY?

Eti Goyal

Mathematics is not about numbers, equation, computation, or algorithms it is about UNDERISTANDING.

Total number of words = 720
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Answered on 30/11/2016 Learn Permutations +2 Mathematics

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Given 5 flags of different colours, how many different signals can be generated if each signal requires...
Given 5 flags of different colours, how many different signals can be generated if each signal requires the use of 2 flags, one below the other?

Abhilash Sharma

Teacher for 8th-12th)

5C2 *2! = 20 Out of 5 flags choosing any two will give you a signal. Now these flags can be interchanged (suppose red on top and blue below it, now blue on top and red below it) Hence 2! for this arrangement among these two colours themselves.
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Answered on 14/10/2016 Learn Permutations +2 Mathematics

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Using all the letters of the word "FRIDAY", how many different words can be formed?

Latha R.

Tutor

Total letters in word FRIDAY are 6, so 6! ways letters can be arranged so total words formed are 6*5*4*3*2*1=720
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Answered on 12/10/2016 Learn Permutations +2 Mathematics

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How many different five-letter words can be formed using the letter from the world INDIA?

Durgesh Kumar

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5!/2! = 5*4*3*2!/2! = 5*4*3 = 60
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Answered on 12/10/2016 Learn Permutations +2 Mathematics

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What is the value of 6P3?

Durgesh Kumar

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Q:- 6P3 =6!/(6-3)! =6*5*4*3!/3! =6*5*4 =120
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