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Engineering Mathematics Miscellaneous
  1. A box contains 25 parts of which 10 are defective. Two parts are being drawn simultaneously in a random manner from the box. The probability of both the parts being good is
    1. 7
      20
    2. 45
      125
    3. 25
      29
    4. 5
      9
Correct Option: A

Required Probability =
15C2
 =
15 × 14
 =
7
25C225 × 2420


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