which of the following numbers is not the sum of three consecutive numbers
I.51
II.61
III.72
IV.81

Question

which of the following numbers is not the sum of three consecutive numbers
I.51
II.61
III.72
IV.81

kainui · Answer

What are consecutive numbers? Suppose I give you the number x. What's the next consecutive number?

mitu12 · Answer

the question doesnt tell that

kainui · Answer

You're right. The problem doesn't tell you how to solve it. I'm telling you how to solve it.

mitu12 · Answer

how

mitu12 · Answer

i dont understand this you could get me started

kainui · Answer

So if I give you the number 3, the next number is 4 isn't it? These are consecutive numbers.

Now more generally, if I give you the number x, the next number is x+1 right? So can you use this fact to help figure this out?

mitu12 · Answer

i tried that method but i dont know which answer choice