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4-letter Code Words

Posted: Mon Jan 21, 2019 12:14 am
by Tasnood
How many $4$-letter code words can be formed from the letters in $CALCULUS$?

Re: 4-letter Code Words

Posted: Mon Jan 21, 2019 11:04 am
by samiul_samin
Tasnood wrote:
Mon Jan 21, 2019 12:14 am
How many $4$-letter code words can be formed from the letters in $CALCULUS$?
What means code words?

Re: 4-letter Code Words

Posted: Mon Jan 21, 2019 8:58 pm
by Tasnood
Doesn't need to have a meaning of the new words

Re: 4-letter Code Words

Posted: Mon Jan 21, 2019 10:46 pm
by samiul_samin
Tasnood wrote:
Mon Jan 21, 2019 8:58 pm
Doesn't need to have a meaning of the new words
Answer
$354$
Solution
Total $8$ letters.

There are three cases:
Case $1$:
All different letters
$120$

Case $2$:
$2$ differnt and $2$ same letters
$216$

Case $3$:
$2$ same and other $2$ same
$18$

Answer=$120+216+18=354$