Question

Observe the patterns and fill in the blanks:

$$\begin{gathered} 1+11=12 \\ 1+11+111=123 \\ 1+11+111+1111=\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ \\ 1+11+111+1111+11111=\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ \end{gathered}$$

• A. $1234$
• B. $12345$

Answer 1

Hence , required numbers are $1234$and $12345$ .