Write a function called removeevens to remove all the even numbers from input row array inrowarray, which contains integer numbers. the function removeevens should use the mod internal function and operate on a row array of any length. hint: logical indexing and the double square brackets [] should be used. the mod function should be used to identify even numbers, along with combination with logical indexing, and the empty array operator [] to remove the even numbers. restrictions: loops should not be used. ex:

Suppose there is a relation r(a, b, c) with a b+-tree index with search keys (a, b).1. what is the worst-case cost of finding records satisfying 10 < a < 50 using this index, in terms of the number of records n1, retrieved and the height h of the tree? 2. what is the worst-case cost of finding records satisfying 10 < a < 50 and 5 < b < 10 using this index, in terms of the number of records n2 that satisfy this selection, as well as n1 and h defined above? 3. under what conditions on n1 and n2, would the index be an efficient way of finding records satisfying the condition from part (2)?