What is the binary representation of the decimal number 156 in 8421 BCD?

The binary representation of the decimal number 156 in 8421 BCD (Binary Coded Decimal) involves converting each digit of the decimal number into its corresponding 4-bit binary form.

The decimal number 156 consists of the digits 1, 5, and 6. Each of these digits is converted separately into binary:

• The digit "1" in binary is represented as 0001.

• The digit "5" in binary is represented as 0101.

• The digit "6" in binary is represented as 0110.

When combined, you write each 4-bit binary representation side by side for BCD. Therefore, the complete binary representation of the decimal number 156 in 8421 BCD is:

• For 1: 0001

• For 5: 0101

• For 6: 0110

Putting these together results in: 0001 0101 0110. This matches the first choice, confirming that it is the correct representation of the decimal number 156 in BCD format.