Find the number of ways in which: (a) a ...

Find the number of ways in which: `(a)` a selection `(b)` an arrangement, of four letters can be made from the letters of the word `'PROPORTION'`

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How many selections and arrangementsof 4 letters can be made from the letters of the word PROPORTION?

Find the number of ways in which a selection of four letters can be made from the letters of the word "PROPORTION".

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