An online store uses 6-bit binary sequences to identify each unique item for sale. the store plans to increase the number of items it sells and is considering using 7-bit binary sequences. which of the following best describes the result of using 7-bit sequences instead of 6-bit sequences?
a) 2 more items can be uniquely identified.
b) 10 more items can be uniquely identified.
c) 2 times as many items can be uniquely identified.
d) 10 times as many items can be uniquely identified.

Write a method named addall that could be placed inside the hashintset class. this method accepts another hashintset as a parameter and adds all elements from that set into the current set, if they are not already present. for example, if a set s1 contains [1, 2, 3] and another set s2 contains [1, 7, 3, 9], the call of s1.addall(s2); would change s1 to store [1, 2, 3, 7, 9] in some order. you are allowed to call methods on your set and/or the other set. do not modify the set passed in. this method should run in o(n) time where n is the number of elements in the parameter set passed in.

An english teacher would like to divide 8 boys and 10 girls into groups, each with the same combination of boys and girls and nobody left out. what is the greatest number of groups that can be formed?

Peter is thinking of a number which isless than 50. the number has 9 factors. when he adds 4 to the number, itbecomes a multiple of 5. what is thenumber he is thinking of ?