Charak Samhita
सङ्ख्या स्याद्गणितं, योगः सह संयोग उच्यते। द्रव्याणां द्वन्द्वसर्वैककर्मजोऽनित्य एव च ॥३२॥
Sankhya is mathematics (including statistics). Joining together (of entities) is samyoga. This is of three types according to the active participation of both, all or one partner. It is non-eternal.
english translation
saGkhyA syAdgaNitaM, yogaH saha saMyoga ucyate। dravyANAM dvandvasarvaikakarmajo'nitya eva ca ॥32॥
hk transliteration by Sanscript