Number of five element subset that can be chosen from the set of the first 11 natural numbers so that at least two of the five elements are consecutive, is

A subset of 5 elements is chosen from the set of first 15 natural numbers. The probability that at least two of the five numbers are consecutive is lambda , then the value of (22)/(lambda) is equal to

A subset of 5 elements is chosen from the set of first 15 natural numbers. The probability that at least two of the five numbers are consecutive is lambda , then the value of (22)/(lambda) is equal to

If A is a set of first 10 natural numbers then number of subsets of A are

If A is a set of first 10 natural numbers then number of subsets of A are

A number is chosen at random from the first 11 natural numbers, then the probability that the chosen number is even, is -

A number is chosen at from the first 11 natural number, then the probability that the chosen number is even is

The number of one element subset,the number of two element subsets and the number of three element subsets o fa set containing more than three elements are consecutive terms of an A.P.The number of elements in the set can be