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Conversion from Binary to Decimal is easy if you use this common method:

Assign a decimal value to each place of the binary number starting with 1 at the right-hand digit.

Double each decimal value going right to left <== for each remaining binary digit, 1's and 0's.

Add up the decimal numbers that correspond to 1's in the binary number.

1, 1, 0, 1, 1, 0, 0, 1 binary

128, 64, 32, 16, 8, 4, 2, 1 = 128+64+16+8+1 = 217 decimal

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Q: What is 1101 1001 in decimal?
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