4 books, 1 each in Chemistry, Physics, Biology, and Mathematics are to be arranged in a shelf. In how many ways can this be done?

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None of these

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Solution

The correct option is B 24
4 different books can be arranged among themselves, in a shelf, in P (4, 4)
$= 4 \times 3 \times 2 \times 1 = 24$ ways.

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4 books, 1 each in Chemistry, Physics, Biology, and Mathematics are to be arranged in a shelf. In how many ways can this be done?

The correct option is B 244 different books can be arranged among themselves, in a shelf, in P (4, 4) =4×3×2×1=24 ways.

The correct option is B 24
4 different books can be arranged among themselves, in a shelf, in P (4, 4)
$= 4 \times 3 \times 2 \times 1 = 24$ ways.