If S={1,2,3,4,5,6,7} and X is a subset of S such that for each k belongs to X , k+1does not belongs to X then number of such subset of S

If A = {1,2,3,4}, then the number of subsets of A is:

The statement that does not belong to bohr 's model of atom is

Let S = {1,2,3,..., 40} and let A be a subset of S such that notwo elements in A have their sum divisible by 5. What is themaximum number of elements possible in A?

Outer configuration of X is 3d^5,4s^1 . It belongs to group number -

Let S = {1,2,3,.............. n} and A={(a ,b)"|"1lt=a ,blt=n}=SxxS . A subset B of A is such that (x ,x) in B for every x in Sdot Then find the number of subsets Bdot

If k=sin^(6)x+cos^(6)x, then k belongs to the interval

Let S={1,2,3, …, 100} . The number of non-empty subsets A to S such that the product of elements in A is even is

Let S={1,2,3, . . .,n} . If X denotes the set of all subsets of S containing exactly two elements, then the value of sum_(A in X) (min. A) is given by

Let S={1,2,...,20} A subset B of S is said to be "nice" , if the sum of the elements of B is 203. Then the probability that a randomly chosen subset of S is "nice" is: (a) 7/(2^20) (b) 5/(2^20) (c) 4/(2^20) (d) 6/(2^20)

S is a set containing n elements. A subset AS of S is selected . The set S is reconstructed by replacing the elements of A.A subset B of S is now selected. If the numer of ways of selecting subsets A and B of S such that AcapB=phi is 81, then n= (A) 3 (B) 4 (C) 5 (D) none of these