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write down all the permutations of t...

write down all the permutations of the set of four letters E,O,N,T taken two at a time

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The correct Answer is:
`(n-r-1).(n-r)`
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ARIHANT SSC-PERMUTATIONS & COMBINATIONS -FINAL ROUND
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  5. Six identical coins are arranged in a row. The total number of ways in...

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  15. The number of ways in which 30 coins of one rupee each be given to six...

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  16. The number of circles that can be drawn out of 10 points of which 7 ar...

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  17. The number of natural numbers of two or more than two digits in which ...

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