How many six-letter words can be made from (a,b,c,d,e,f) using "a" twice "b" twice and no other letter more than once?
NOTE: THEY DONT HAVE TO BE REAL WORDS.
How about using "a" 3 times and "b" once and no other letter more than once?
How abt using "a" 3 times and "b" twice and no other letter more than once?
How abt using exactly two "a" and one "b" and no other letter more than once?
How abt in (a, b, c, d, e, f, g, h, 1, 2, 3, 4), how many subsets contain all four numerals? How many contain exactly two numerals? How many contain exactly 3 letters and two numerals?
I need a general idea how to do the problems. Thank you!
2006-12-15
15:45:16
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4 answers
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asked by
AR2706
2
in
Mathematics