Number Series Puzzles or Questions are used all around us whenever we talk about evaluating the IQ. Almost all entrance tests comprises of them. Number Series Questions are asked in the interview too. Also most of the people who love to solve mathematics puzzle will agree that Number Series are the most enjoyable puzzles. The following section is devoted to all such enthusiast brain buddies.
6 + 6 + 6 = N (last letter of sum i.e. eighteen)
7 + 7 + 7 = E (last letter of sum i.e twentyone)
8 + 8 + 8 = R(last letter of sum i.e twentyfour)
0 + 0 + 0 = O (last letter of sum i.e. zero)