Answer:
414, 415, 416
Explanation:
Consecutive numbers means they come one after another, like 1,2,3,4,5... So they all follow the formula x, x+1, x+2, x+3...x+n.
Since there are 3, we can say that x+(x+1)+(x+2)=1,245.
Simplify that to 3x+3=1,245, and then subtract 3 from both sides.
We get 3x=1,242. Divide that by 3, and you get x=414.
Add 1 and 2 to 414, and you get 414, 415, and 416.
You can add them up to check.