1.(i) If `n(A)=2` hen find the value of `n(p(A))`

find the value of P(n,n-1)

The means and variance of n observations x_(1),x_(2),x_(3),…x_(n) are 0 and 5 respectively. If sum_(i=1)^(n) x_(i)^(2) = 400 , then find the value of n

If .^(n)C_(4),.^(n)C_(5), .^(n)C_(6) are in A.P., then find the value of n.

If P(n ,4)=20xxP(n ,2), then find the value of n

If Sigma_(i=1)^(2n) cos^(-1) x_(i) = 0 ,then find the value of Sigma_(i=1)^(2n) x_(i)

If .^(n)P_(4): .^(n)P_(5) = 1:2 , find the value of n.

If sum_(r=1)^(n)((tan 2^(r-1))/(cos2^(r )))=tanp^(n)-tan q , then find the value of (p+q) .

lim_(nrarroo)(1/(n+1)+1/(n+2)+…….+1/(6n))=kln6 , then find the value of k

If "^(2n+1)P_(n-1):^(2n-1)P_n=3:5, then find the value of n .

If n in NN , then find the value of i^n+i^(n+1)+i^(n+2)+i^(n+3) .