Question

A box of 600 electric bulbs contains 12 defective bulbs.One bulbs is taken out at random from these box.What is the probability that it is a non defective bulb?

Answer 1

The probability that one bulb taken out random is non-defective is .

Step-by-step explanation:

Given as :

The number of bulb in the box = 600

The number of defective bulb in box = 12

Let The probability that one bulb taken out random is non-defective = p(E)

According to question

As out of 600 bulbs, 12 bulbs are defective

So, The number of non-defective bulb = 600 - 12 = 588

Now, out of 600 bulbs, 1 bulb is chosen in

And favourable case of chosen non-defective =

So, probability =

Or, p(E) =

Or, p(E) =

Hence, The probability that one bulb taken out random is non-defective is . Answer

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Answer 2

The number of bulb in the box = 600

The number of defective bulb in box = 12

Let The probability that one bulb taken out random is non-defective = p(E)

According to question

As out of 600 bulbs, 12 bulbs are defective

So, The number of non-defective bulb = 600 - 12 = 588

Now, out of 600 bulbs, 1 bulb is chosen in

And favourable case of chosen non-defective

Or, p(E) = 588/600

Or, p(E) = 49/50

Hence, The probability that one bulb taken out random is non-defective is 49/50