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Among 9 identical-looking coins one is heavier than the rest. What is the minimum number of weighings on a two-pan balance that is certain…

1815Medium DSSSB TGT Computer Science 0 replies 1 views
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Among 9 identical-looking coins one is heavier than the rest. What is the minimum number of weighings on a two-pan balance that is certain to find the heavier coin?

  • A1
  • B2
  • C3
  • D4
Correct answer: B

Explanation

Weigh 3 coins against 3 to find the group of 3 that holds the heavy coin, then weigh two coins of that group against each other, so 2 weighings are enough.
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