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* Weekly jobless claims unexpectedly rise
* Micron jumps after upbeat revenue forecast
* Indexes: Dow +0.50%, S&P 500 +0.95%, Nasdaq +1.48% (New throughout, updates prices, market activity and comments to add afternoon trading, new byline)
By Noel Randewich
April 1 (Reuters) – The S&P 500 jumped past the 4,000 mark for the first time on Thursday, riding gains…
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