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Two dice are thrown, one white and one black. In how many outcomes do they show different numbers?

Competition practicePermutations & Combinations
  • A36
  • B15
  • C6
  • D30

Step-by-Step Solution

All outcomes ; equal pairs (1,1)…(6,6) are 6. Different: . (15 treats the dice as alike.)
Answer: D) 30

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