Question

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

Answer 1

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

Answer 2

the question doesnt tell that

Answer 3

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

Answer 4

how

Answer 5

i dont understand this you could get me started

Answer 6

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?

Answer 7

i tried that method but i dont know which answer choice