Not understood the answer

#1

Since the lower bound function returns the element having value equal or just greater than the input, this set doesn’t have 15 in it. So how did the lower bound function return ans as 6

#2

it is returning the end of iterator or call it the iterator size since no element

is found

#3

This doubt is for Q7 in the quiz.

#4

ya so i told u the answer for q 7