Shares of First Chicago NBD Corp. shot up 6.93% Tuesday to $79.0625 on speculation that it had agreed to be bought by Columbus, Ohio-based Banc One Corp. Officials from the banks were unavailable Tuesday or declined to comment.

Such a combination would create a $226.4 billion asset bank with an especially strong credit card business. Its $50 billion in receivables would surpass that the largest card issuer, Citicorp, which has $45.8 billion.

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