A person has to make 141 pieces of a long bar. He takes 2 seconds to cut a piece. What is the total time taken by him in seconds to make 141 pieces?
a) 560
b) 280
c) 112
d) 324

• 280
  since we have to make 141 cuts
  after 140 cuts the remaining will be the last cut
  so 140 * 2 = 280 seconds required
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• ans b)280
  for first cut we get two pieces
  second cut we get three pieces
  like wise in 140th cut we get 141 pieces...
  for each cut 2 seconds here 140 cuts so 140*2=280 seconds
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• 140*2=280
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• 280
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• in order to make 141 pieces he has to make 140 cut since last piece is the 141th piece
  140*2=280(since he take 2 seconds for each cut)
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• 280
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• he totally cut 140 pieces.. 140*2=280
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