Discussion
Insert the missing number 5, 10, 13, 26, 29, 58, 61, (....)
Answer: A
The operations alternate between doubling and adding 3.
\[ 5 \times 2 = 10,\quad 10 + 3 = 13,\quad 13 \times 2 = 26,\quad 26 + 3 = 29 \]
\[ 29 \times 2 = 58,\quad 58 + 3 = 61,\quad 61 \times 2 = \mathbf{122} \]
The next operation is a doubling because the previous one was an addition; 64 would come from adding 3 again.
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