{"machine":"combinatorics","slot":"S164","title":"Combinations and permutations","how_to_call":"POST https://innernetcorp.com/machines/combinatorics with Content-Type: application/json","price_usd":"$0.003","currencies":["USDC","EURC"],"payment":"x402: send the POST without payment to receive a 402 with signed requirements; pay any option and retry.","input_example":{"n":52,"r":5,"operation":"combinations"},"input_schema":{"type":"object"},"summary":"Exact nCr, nPr and factorials with BigInt precision - probability, sampling, lottery odds.","catalog":"/catalog"}