3) If `A={5,2,3,4}` then find `n(A)`

If A={1,2,3},\ B={3,4}a n d\ C={1,3,5} , find (AxxB)nn(AxxC)

If A={1,3,5,6}a n d\ B={2,4}, find AxxB\ a n d\ BxxAdot

If A={1,2,3},\ B={3,4}a n d\ C={1,3,5} , find Axx(BnnC)

If A=(x : x=4n+1,nle5,n in N} and B={3n : n le 8, n in N} , then find (A-(A-B)) .

Let "U"={1,2,3,4,5,6,7,8,9},A={2,4,6,8}a n dB={2,3,5,7}dot Find: (AuuB)'

Let "U"={1,2,3,4,5,6,7,8,9},A={2,4,6,8}a n dB={2,3,5,7}dot Find: (AnnB)'

If the middle points of the sides of a triangle are (-2,3),(4,-3),a n d(4,5) , then find the centroid of the triangle.

(i) If (n!)/(2.(n-2)!): (n!)/(4!.(n-4)!) = 2:1 , find the valye of n. (ii) If ((2n)!)/(3!(2n-3)!): (n!)/(2!(n-2)!) = 44:3 , then find the value of n.

If Delta_r =|[2^(r-1) ,2.3^(r-1), 4.5^(r-1)],[alpha,beta,gamma],[2^n-1, 3^n-1, 5^n-1]| , then find the value of Delta

If P(n ,5): P(n ,3)=2:1 find n