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In how many arrangements of the letters of PENCIL is N always immediately next to E (either side)?

Competition practicePermutations & Combinations
  • A240
  • B120
  • C720
  • D480

Step-by-Step Solution

Glue E and N into a block: 5 units arranged in ways; the block can be EN or NE: . Total 240. (120 allows only EN.)
Answer: A) 240

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