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Suppose A(1) ,A(2) ,. . . .,A(30) are ...

Suppose `A_(1) ,A_(2) ,. . . .,A_(30) ` are thirty sets each with fvie elements and `B_(1),B_(2), .. . .,B_(n)` are n sets elements such that `bigcup_(i=1)^(30)A_(i)= bigcup _(i=1)^(n)B_(i)` and exactly 9 of the `B_(j)`'s then the value of n , is

A

15

B

135

C

45

D

90

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The correct Answer is:
C
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OBJECTIVE RD SHARMA-SETS-Exercise
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  2. Let A={(x,y):y=e^(x) , x in R } B={(x,y),Y=e^(-x) ,x in R}then

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  3. Suppose A(1) ,A(2) ,. . . .,A(30) are thirty sets each with fvie ...

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  4. IF sets A and B are defined as A={(x,y):y-(1)/(x),0ne x in R} B= {(x...

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  5. if a N={a x:x iin N} and b N cap c N , where b,c in Nare relative...

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  6. If aN = {ax|x in N} and bN nn cN = dN, where b,c in N, then

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  8. In a town of 10000 families, it was found that 40% families buy ne...

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  9. Consider the set A of all matrices of order 3 xx 3 with entries 0 or 1...

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  10. if A and B are two sets , then A cap (A cup B) equals

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  11. if n(A)=n, then P(A) has

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  12. if A ={phi ,{phi}}, then the power set of A is

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  13. Let A and B have 3 and 6 elements respectively , what can be the...

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  14. Two finite sets have m and n elements . The total number of subs...

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  15. if X and Y are two sets , then X cap (Y cup X)'equals

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  16. Let A= {x: is a multiple of 3 } and B= { x:x is a multiple of 5}...

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  17. Let A ={1,2,3},B={3,4},C={4,5,6}.thenAcup (B cap C)is

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  18. Let A and B be two non-empty subsets of a set X such that A is ...

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  19. Let U be the universal set for sets A and B such that n(A) =200 ...

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  20. Out of 800 boys in a school, 224 played cricket, 240 played hockey and...

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