Question
The number of 7-letter sequences which use only P, Q, R (and not necessarily all of these) and with P never immediately followed by Q, Q never immediately followed by R and R never immediately followed by P is
Answer: Option B
:
B
We have 3 choices for the first letter, and 2 for each subsequent letter. So 3×26= 192
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:
B
We have 3 choices for the first letter, and 2 for each subsequent letter. So 3×26= 192
Was this answer helpful ?
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