Students are to march in a parade. There will be one first grader, two second graders, three third graders, and so on, through the twelfth grade. How many students will march in the parade?

Question

anonymous · Answer

@calculusxy HELP plz

anonymous · Answer

these are the answer choices 
a.
108 students
c.
42 students
b.
36 students
d.
78 students

calculusxy · Answer

There is a pattern if you notice. If one student is for first grade and two students for second grade, then what is the pattern?

anonymous · Answer

no i didnt notice . whats the answer

calculusxy · Answer

Just put this to a list if you want to make it simple. 
1,2,3...

calculusxy · Answer

@jamrobin19 Please cooperate with me with this problem.

anonymous · Answer

it was 78