H contracted with NIC Corporation for the erection of a number of houses. In calculating his price for the houses, H by mistake deducted a particular sum twice over. The corporation affixed its seal to the contract, which correctly represented its intention.

The contract is BINDING because the corporation's acceptance of the contract created a valid agreement. H's unilateral mistake in calculation (deducting twice) does not prevent contract formation. Both parties were in agreement on the essential terms, and the corporation's acceptance properly reflected its intention. A unilateral mistake doesn't typically avoid a contract unless it's a fundamental mistake known to the other party.