The numeral word standing as the first member of a dvanda samāsa , preserves its accent.,
Thus ए꣡कादश, द्वा꣡दश, त्र꣡योदश or त्रयोद꣡श ॥ The word एक is derived from इण् by कन् affix (Unadi III. 43) and has acute on the first 6.1.197. The त्रयस् is the substitute of त्रि 6.3.48 and has acute on the final.,