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JEE Mains · Maths · STD 11 - 6. permutation and combination

If the letters of the word \(MOTHER\) be permuted and all the words so formed (with or without meaning) be listed as in a dictionary, then the position of the word \(MOTHER\) is

  1. A \(307\)
  2. B \(308\)
  3. C \(310\)
  4. D \(309\)
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Answer & Solution

Correct Answer

(D) \(309\)

Step-by-step Solution

Detailed explanation

MOTHER \(1 \rightarrow \mathrm{E}\) \(2 \rightarrow \mathrm{H}\) \(3 \rightarrow \mathrm{M}\) \(4 \rightarrow \mathrm{O}\) \(5 \rightarrow \mathrm{R}\) \(6 \rightarrow \mathrm{T}\) So position of word MOTHER in dictionary \(2 \times 5 !+2 \times 4 !+3 \times 3 !+2 !+1\)…
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