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Question

Extended ASCII, an 8-bit evolution of the original 7-bit ASCII standard, supports international text by expanding the character set. How many total codes does it provide?

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RRB NTPC 2025 Graduate CBT 2 Question Paper PDF (10-Jul-2026) (Shift 1)
The correct answer is

256 codes including accented characters

The number of distinct codes a character set can represent depends on the number of bits used, since each bit doubles the possibilities.

The original ASCII standard used 7 bits, giving \(2^{7} = 128\) codes, which covered English letters, digits, and basic control and punctuation characters.

Extended ASCII adds one more bit, making it 8 bits (1 byte), so it can represent \(2^{8} = 256\) codes.

The extra 128 codes (from 128 to 255) are used for accented letters, symbols, and characters needed for various European languages.

Hence, Extended ASCII provides 256 codes including accented characters.

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