I think "nope" is just fine, it's just more casual. "No" is a little more formal.
2012年5月31日
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We don't use it I think they use it in USA. Just say no is best
2012年5月31日
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The "p" sound in "nope" gives it a sense of finality (same with "yep"). In a formal context, this level of bluntness (and slanginess) is not acceptable.