The number that constitutes a quorum of shareholders is two. These two shareholders are allowed to be present in person or in proxy.
10,001 shareholders must be represented because, in order for a decision to be made at the shareholder's meeting, at least 51% of the total number of shares or the group or persons holding over 50% of the share must vote in that direction. 10,001 represents over 50% of 20,000 shares.
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