In a table used for converting from decimal to binary, the top row typically represents the powers of 2, since binary is a base-2 numeral system. The powers of 2 in ascending order would be:
- \( 2^0 = 1 \)
- \( 2^1 = 2 \)
- \( 2^2 = 4 \)
- \( 2^3 = 8 \)
- \( 2^4 = 16 \)
- \( 2^5 = 32 \)
- and so on.
So, the correct response from your options is 1, 2.