Functions Question 350
Question: If $ A={8,9,10} $ and $ B={1,2,3,4,5}, $ Then the number of elements in $ A\times A\times B $ are
Options:
A) 15
B) 30
C) 45
D) 75
Show Answer
Answer:
Correct Answer: C
Solution:
[c] $ n(A\times B\times C\times …)=n(A)\times n(B)\times n(C)\times …. $
$ \therefore n(A\times A\times B)=n(A)\times n(A)\times n(B)=3\times 3\times 5=45 $ $ [\because ,n(A)=3,n(B)=5] $
BETA
