If `N_a= {a_n | n in N}`, describe`N_4 nn N_6` and `N_3 nn N_5`.

If N_k= {k_n: n in N} , find N_3 nn N_5 and N_4 nn N_6 .

If N_(a)={an:ninN} , then N_(5) nn N_(7) equals

In an AP :- given a = 5, d = 3, a_n = 50 find n and S_n .

In an AP :- given a = 2, d = 8, S_n = 90 find n and a_n .

In an AP :- given a_n = 4, d=2, S_n =-14, find n and a .

In an AP :- given a = 8, a_n = 62. S_n =210, find n and d .

Determine the number n in a geometric progression {a_n} , if a_1= 3, a_n= 96 and S_n= 189 .

If |[ x^n ,x^(n+2) ,x^(2n)],[1 ,x^a , a ],[x^(n+5),x^(a+6),x^(2n+5)]|=0,AAx in R, where . n in N , then value of a is a. n b. n-1 c. n+1 d. none of these

Find the sum to n terms of the sequence {a_n} , where a_n=5-6n, n in N .

If A and B are two sets such that : n(A)=20, n (A uu B)=42 and n (A nn B)=4 . Find: n (B), n (A - B) and n (B - A).