## Realated Questions

Let S be a set of positive integers such that every element n of S satisfies the conditions

1. 1000 ≤ n ≤ 1200

2. every digit in n is odd

Then how many elements of S are divisible by 3?Let x=√4 + √4 - √4 + √4 - …. to infinity. Then x equals

Let S be the set of five-digit numbers formed by the digits 1, 2, 3, 4 and 5, using each digit exactly once such that exactly two odd positions are occupied by odd digits. What is the sum of the digits in the rightmost position of the numbers in S?