Permutation-Combination
Aptitude

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Q.

If the letters of the word $SACHIN$ are arranged in all possible ways and these words are written out as in dictionary, then the word $SACHIN$ appears at serial number:

 A.

$601$

 B.

$600$

 C.

$603$

 D.

$602$

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Solution:
Option(A) is correct

If the word started with the letter $A$ then the remaining 5 positions can be filled in $5!$ Ways.

If it started with $C$ then the remaining 5 positions can be filled in $5!$ Ways

Similarly if it started with $H, I, N$ the remaining 5 positions can be filled in $5!$ Ways

If it started with $S$ then the remaining position can be filled with $A,C,H,I,N$ in alphabetical order as on dictionary

The required word $SACHIN$ can be obtained after the $5×5!=600$ Ways

i.e. $SACHIN$ is the $601^{th}$ letter.


(1) Comment(s)


Abc
 ()

lol it will be 601st word and not 601th .. :P