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SWATI SHARMA

· started a discussion

· 1 Months ago

Not Understood (Question: 88301.0 )

How 2^5 is used?

Question:

Avinash wants to invite his friends for his birthday party. He has 10 friends out of which 5 are boys and the rest are girls. In how many ways can he invite them if he decides to invite just 2 girls?

Options:
A) 1200
B) 640
C) 320
D) \((5!)^2\)
E) None of these
Solution:

Ans: (c) Number of way selecting 2 out of the 5 girls = 5C2 = 10 

Each of the boy can either be invited or not invited 

Hence number of ways = 25 = 32

∴ total number ways of inviting = 32 × 10 = 320 ways.

Knowledge Expert

· commented

· 1 Months ago

Its formula......

Number of ways n identical things can be arranged among r different places = r^n

r=2 and n=5
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