Find total number of distinct permutations of the letters of the word ‘RADAR’.
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Answer: 120
Step-by-step explanation:
slot method
5 letters
1st slot=5 options
2nd slot=4 options (1 went ot first slot)
3rd slot=3 options (1 went to 2nd)
4th slot=2 options
5th slot=1 option
permutations which can be made = 5 × 4 × 3 × 2 × 1
= 120
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