इफ ए कॉस्ट ऑफ एन आइसक्रीम में ₹3 हाउ मेनी आइसक्रीम कैन परचेज 6000
Answers
There are eight varieties of ice creams inn the ice cream parlour.
We need to choose 3 creams where atleast two ice creams are of the same variety.
The first possibility is that the three ice creams chosen are of the same variety.
∴ number of ways of choosing 3 ice creams which are of the same variety n 1
= 8 P 1
=8
The second possibility is that the two ice creams are of the same variety and the third is of another variety.
∴ number of ways choosing 2 ice creams of same variety and third ice cream of another variety, n 2
= 8 P 1 . 7 P 1
=8.7
=56
Hence, number of ways of choosing 3 ice creams taking atleast two ice creams of the same variety =n
1 +n 2
=8+56
=64