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.
A) 5/19 B) 3/20 C) 21/38 D) None of these
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Answer:
HEY mate I hope that you have a little knowledge of permutations and combinations.
If not then note it the formula for combination ncr=n factorial/R factorial *(n-r) factorial.
SP LET'S SOLVE YOUR QUESTION.
HOPE IT HELPS YOU. PLZ MARK IT IS BRAINLIEST
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Answered by
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Answer:
C)21/38
Step-by-step explanation:
total bulbs =20
selecting from total bulbs=20C2=190
non defective bulbs =15
selecting from non defective bulbs=15C2=105
probability that both bulbs are non defective=105/190=21/38
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