जॉइन Examsbookउत्तर : 3. "21/38"
A box contains 5 detective and 15 non-detective bulbs. Two bulbs are chosen at random. Find the probability that both the bulbs are non-defective.5
प्र: A box contains 5 detective and 15 non-detective bulbs. Two bulbs are chosen at random. Find the probability that both the bulbs are non-defective.
- 15/19false
- 23/20false
- 321/38true
- 4None of thesefalse
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उत्तर : 3. "21/38"
व्याख्या :
Answer: C) 21/38 Explanation: n(S) = C220 = 190 n(E) = C215 = 105 Therefore, P(E) = 105/190 = 21/38
समान प्रश्न
Since Nithya and Suganya exchange places, so Rita’s new position is the same as Monika’s earlier position. This position is 17th from the right and 10th from the left. Therefore Number of girls in the row = (16 + 1 + 9) = 26.