Password dalibor

Kamila wants to change the password daliborZ by

a) two consonants exchanged between themselves,
b) changes one little vowel to such same great vowel
c) makes this two changes.

How many opportunities have a choice?

Correct result:

a =  13
b =  3
c =  16

Solution:

$a=(5\cdot 4+3\cdot 2)\mathrm{/}2=13$

$b=1+1+1=3$

$c=(5\cdot 4+3\cdot 2)\mathrm{/}2+3=16$

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