Question

A box contains 20 electric bulbs, out of which 4 are defective. Two bulbs are chosen at random from this box. The probability that at least one of these is defective is​

Answer 1

Answer:

Step-by-step explanation:

Answer 2

Step-by-step explanation:

the total no. of bulb is 20

and total no. of fuse bulb is 4

so probability of this is

probability = no. of fuse bulb/total no. of bulb

. 4/20= 0.2

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