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Q:

In a class, there are ' z ' students. Out of them ‘x’ are boys. What part of the class is composed of girls? 

  • 1
    $$1-{x\over z} $$
  • 2
    $${x\over z}-1 $$
  • 3
    $${x\over z} $$
  • 4
    $${z\over x} $$
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Answer : 1. "$$1-{x\over z} $$"

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