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Numerical Ability
Permutation and Combination
in how many ways seven letters between A & B be arranged from alphabets so that repetition is not allowed?
Read Solution (Total 18)
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- 7 letters between A & B &,A,B has a fixed position
so,
24P7 * 2! - 10 years agoHelpfull: Yes(30) No(4)
- TCS Ans 36*24!
- 10 years agoHelpfull: Yes(10) No(2)
- there should be seven letters in between i.e. 7 places to be occupied by the (26-2) alphabets , since A and B wont be repeated.
Hence the ans will be 24P7 - 10 years agoHelpfull: Yes(9) No(7)
- 7 letters can be arranged in 24p7 ways
and there will be 2! ways of arrangement of two words A&B,B&A
and now consider the these 9 words as a single word therefore rest of the words can be arranged as (26-9+1)! ways
ans:24p7*2!*18! - 10 years agoHelpfull: Yes(8) No(0)
- 7 letters between a and b means a and b are fixed at first and last position.
so remaining space 5, letters=5
5!=120 - 10 years agoHelpfull: Yes(3) No(13)
- A 24*23*22*21*20 B = 5100480 there is remaining 24 letter so after permutation..
- 10 years agoHelpfull: Yes(2) No(2)
- There are 7 letters between A&B, we can choose 7 letters from remaining alphabet i.e(26-2). So 24p7, again we can change the positions of A& B hence solution is 2*24p7
- 10 years agoHelpfull: Yes(1) No(1)
- A _ _ _ _ _ _ _ B
7 PLACES CAN BE FILLED IN BY 24 LETTERS
24P7*2 AS A AND B CAN BE WRITTEN IN TWO WAYS
- 10 years agoHelpfull: Yes(1) No(3)
- 24p7*2!*7* bcoz a&b can change there position in two ways and those 7 alphabets can also change there position in 7 ways
- 10 years agoHelpfull: Yes(1) No(2)
- 24C7*2
7 letters can be selected in 24C7 ways.
and a&b can be placed in 2 ways - 10 years agoHelpfull: Yes(1) No(1)
- 24 letters can be placed in 7 positions in 24p7 ways and a and b can interchange their places also so ans is 24p7*2!
- 10 years agoHelpfull: Yes(1) No(0)
- 24P7
correct ans pls?
- 10 years agoHelpfull: Yes(0) No(3)
- there are 2 ways for A and B, and in between 7 letters without rep
24*23*22*21*20*19*18* 2! for A and B - 10 years agoHelpfull: Yes(0) No(3)
- in b/w a&b with out repetition 24p7 ways are possible..
and b/w b&a also 24p7 ways are possible
soo the ans is 24p7+24p7=24p7 * 2 - 10 years agoHelpfull: Yes(0) No(3)
- ans 26p7
because we thave to arrange 7 letter out of 28 letter
but there is A and B is already given and repetation is not possible so 28-2=26 .
so 26p7
- 10 years agoHelpfull: Yes(0) No(7)
- 24p7*2*7! bec...... 7 out of 24 .theses 7 can arrange in 7! and 2 ways of arranging and b
- 9 years agoHelpfull: Yes(0) No(0)
- 36*24! ans is crct or not ? plss tell
- 9 years agoHelpfull: Yes(0) No(0)
- no of ways of distributing "n" distinct things to "r" different persons is r^n.
since nobody can be excluded from getting a gift, we will subtract the possibility of getting 0 gifts ie 4 cases.
so solution would be r^n-4 - 9 years agoHelpfull: Yes(0) No(0)
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