SOLUTION: Find the number of four-letter strings of the alphabet, repetitions allowed, that contain at least one "G" AND at least one "T." I know that those containing at least one "G" is 2

Question 502465: Find the number of four-letter strings of the alphabet, repetitions allowed, that contain at least one "G" AND at least one "T." I know that those containing at least one "G" is 26^4-25^4, and those containing at least one "T" is 26^4-25^4.
Answer by sudhanshu_kmr(1152) (Show Source): You can put this solution on YOUR website!

number of 4 - letter strings that don't contain G = 24^4
number of 4 - letter strings that don't contain T = 24^4
number of 4- letter strings that don't contain neither G nor T = 24^4

number of four-letter strings of the alphabet, that contain at least one "G" AND
at least one "T." = 26^4 - ( 25^4 + 25^4 - 24^4)

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