partnership

A, B and C. Joining to do business in partnership with firm, namely ABC and company. It is provided in the partnership deed that A will exclusively look after purchases, B will look after sales and C will manage the accounts. In due course X sues the firm and its partners for recovery of money in respect of goods supplied to the farm on orders of C and later sold by C. The defence of A and B is that neither the firm, nor the two of them are liable as according to the partnership deed, C acted unauthorisedly beyond the authority and could not bind them or upon the firm. Will X succeed?