Decimal equivalent number of the binary number is

Correct option is D

​$$\text{To convert the binary number } (10101010)_2 \text{ to its decimal equivalent, we expand it based on positional values:} \\(10101010)_2 = 1 \times 2^7 + 0 \times 2^6 + 1 \times 2^5 + 0 \times 2^4 + 1 \times 2^3 + 0 \times 2^2 + 1 \times 2^1 + 0 \times 2^0 \\\text{Now calculate each term:} \\= 1 \times 128 + 0 \times 64 + 1 \times 32 + 0 \times 16 + 1 \times 8 + 0 \times 4 + 1 \times 2 + 0 \times 1 \\= 128 + 32 + 8 + 2 \\= 170$$​​