Sanskrit Krit Pratyay Exercises - Choose The Correct Option

Choose The Correct Option

'उद्दिध्रेकयिषणम्' is the combination of 'उत् + ध्रेक् + णिच् + सन् - ध्रेकृँ शब्दोत्साहयोः भ्वादिः' dhatu and which pratyaya ?