Hi every one

I have ABCDEF++/-

how to calculate number of permutations when the first and second element

must begin with a letter and also we can use a letter one time in each permutation

thanks

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- Jun 9th 2011, 06:58 AMshaywPermutations
Hi every one

I have ABCDEF++/-

how to calculate number of permutations when the first and second element

must begin with a letter and also we can use a letter one time in each permutation

thanks - Jun 9th 2011, 07:04 AMBAdhi
how far have you gone, show what you've tried please

- Jun 9th 2011, 07:10 AMPlato
- Jun 9th 2011, 07:51 AMshayw
Sorry didn't explain clearly

I have 11 symbols (6 letters ABCDEF and +-*/^)

in each arrangement i use the 11 symbols but the first and second symbol must begin with a letter

eg AB+-CD*/EF^

so i try this

for 9 symbols i have 9! and for the for the first and second symbol 6*5

so 6*5 * 9! - Jun 9th 2011, 07:59 AMPlato