What is the rule for using 'a' or 'an' before words starting with 'x'?

Use Of The A And An Questions

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What is the rule for using 'a' or 'an' before words starting with 'x'?

The rule for using 'a' or 'an' before words starting with 'x' is to use 'an' before words starting with a vowel sound, and 'a' before words starting with a consonant sound.