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2 Answers

1 votes
1 votes
There are 4 letters

Number of strings length 1 = 4C1 = 4

Number of strings length 2 = 4C1 x 4C1 = 4 x 4 =16

Number of strings length 3 = 4C1 x 4C1 x 4C1 = 4 x 4 x 4= 64

Total number of strings upto length 3 = 4+16+64 =84

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