Question

2. how many different 4 letter radio station call letters can be made if repeats are allowed and the first letter must be k
a.1000
b.17,576
c.78
d.456,976

Answer 1

how many different 4 letter radio station call letters can be made if repeats are allowed and the first letter must be k --- # = 1*26*26*26 = 17576 ============================== Cheers, Stan H. a.1000 b.17,576 c.78 d.456,976

Answer 2

Well to find possible number of permutations (where order does matter), use the equation... {{{n^r}}} Where n is the number of choices (26 in this case) and r is the number chosen at a time (4 in this case) When plugged in you get 456,976 different call letters divide that number by 26 and you get 17,576 so the answer is b This works because... Ex. A,B,C can be arranged... A B C A C B B A C B C A C A B C B A there were three choices (or n = 3) and 1/3 of the choices start with A for example, the same applies to the above problem