Answer:
(A) and (B)
Step-by-step explanation:
(A) The given example is:
![7363 + 1535](https://tex.z-dn.net/?f=7363%20%2B%201535)
Adding these two numbers, we get
![8898](https://tex.z-dn.net/?f=8898)
which is an error of addition by one.
Thus, this option is correct.
(B)The given example is:
![3415 + 2174](https://tex.z-dn.net/?f=3415%20%2B%202174)
Adding these two numbers, we get
![6589](https://tex.z-dn.net/?f=6589)
which is an error of addition by one.
Thus, this option is correct.
(C)The given example is:
![5167+4622](https://tex.z-dn.net/?f=5167%2B4622)
Adding these two numbers, we get
![9789](https://tex.z-dn.net/?f=9789)
which is not an error of addition by one.
Thus, this option is not correct.
(D) The given example is:
![2683+6215](https://tex.z-dn.net/?f=2683%2B6215)
Adding these two numbers, we get
![8898](https://tex.z-dn.net/?f=8898)
which is not an error of addition by one.
Thus, this option is not correct.