Question

distance formula.
21.
A box contains 28 bulbs of which 7 bulbs are defective, a bulb is drawn
randomly from the box. Find the probability of picking a non-defective
bulb.​

Answer 1

Answer:

20 bulbs

Step-by-step explanation:

There are 28 bulbs

7 of them are defective

and a bulb is randomly drawn out of the box

Therefore

28-8= 20

Therefore the probability of non defective bulb is 20

Answer 2

$\huge\orange{Answer}$

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$<marquee>☆EXPLANATION☆</marquee>$

=》 Given:-

• Total no. of bulbs = 28.
• No. of defective bulbs = 7

=》 To find:-

Probability of picking up

non- defective bulbs

=》 So here,

Total number of non- defective bulbs = 28-7. = 21.

=》 Therefore probability of picking up non- defective bulb

= Total no. of non-defective bulbs/Total no. of bulbs.

= 21/28.

= 3/4. {Dividing whole by 7}

=》 The probability of picking up non defective bulb = 3/4.

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$<marquee>THANKS</marquee>$