deriv SD cv (1259) ashtadhyayi.com hei.de L 1259 ETT STT a 5.2.49 ALPH OLDHOMEPAGE NEWHOMEPAGE

nAntAd asaGkhyA''der maT

नान्तादसंख्याऽऽदेर्मट् ONPANINI 52049

After a numeral ending in n न्, that is not a compound, /DaT turns into maT.

This maT मट् is not /Dit.

paJcan- पञ्चन् + /DaT by < tasyapUraN...
→ paJcan- पञ्चन् + ma म by this rule
→ paJca- पञ्चॱ + ma म by nalopaHprAt...
→ paJcama- पञ्चमॱ "fifth"

But after a compound numeral —

ekadaza- एकदशॱ "eleventh"

The /Tit makes the feminine get /GI —

paJcamI पञ्चमी