How many arrangements of letters in DISAPPEARANCES have ALL of
the following properties:
(i) there are at least two letters between each A,
(ii) begins with a consonant, and
(iii) the consonants are in alphabetical order.
ANSWER: C(4+(10-4)-1,(10-4))xC(10,7)x1x3!/2!:
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How many arrangements of letters in DISAPPEARANCES have ALL of the following properties: (i) there are...
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