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  9. Q139

APPSC Group-I 2023 · Question 139 of 233

A decorative lamp has 2 brown, 3 green and 4 white bulbs. What is the probability of lighting three bulbs such that at least one bulb that glows is white? 37

General Mental Ability

  1. A37/42Correct
  2. B23/38
  3. C45/47
  4. D29/33

Answer: A. 37/42

Explanation

P(at least one white) = 1 - C(5,3)/C(9,3) = 1 - 10/84 = 37/42.

Source: APPSC Group-I Screening Test (Notification 28/2022, held 08-01-2023), Paper-II: General Aptitude, Q22 (adda247 "Decoding APPSC Group I 2023" compilation with official answer key)

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