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Question Number 190860 by SLVR last updated on 13/Apr/23
Commented by SLVR last updated on 13/Apr/23
$${kindly}\:{help}\:{me} \\ $$$${i}\:{got}\:\mathrm{24}\:{while}\:{repetetions}\:{not} \\ $$$${allowed}.{but}\:{it}\:{become}\:{heavy} \\ $$$${if}\:{repetetions}\:{allowed} \\ $$
Commented by SLVR last updated on 15/Apr/23
$${sir}...{answer}\:{is}\:\mathrm{204}\:{where} \\ $$$${i}\:{took}\:{all}\:{possibilities}\:{got}\:\mathrm{204} \\ $$$${But}\:{how}\:{i}\:{derive}\:{by}\:{using} \\ $$$${C}_{{r}−\mathrm{1}} ^{\left({n}+{r}−\mathrm{1}\right)} .{kindly}\:{explain} \\ $$