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GATE Overflow Test Series | Mixed Subjects | Test 1 | Question: 10

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Because the letters $ACDKL$ must occur as a block, we can find the answer by finding the
number of permutations of eight objects, namely, the block $ACDKL$ and the remaining $7$ letters.

Because these eight objects can occur in any order, there are $8!$ possible permutations of $ABCDEFGHIJKL$ in which $ACDKL$ occurs as a block.

So, the correct answer is $(C)$.
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