Select 20 unique numbers from 000000000 to 999999999
Total possible combinations (ways)
If order does not matter (e.g. most lottery numbers): 411,031,684,235,188,459,371,456,620,423,073,960,768,824,329,252,512,727,848,552,906,392,789,991,861,800,284,130,668,495,830,821,507,489,597,998,959,442,811,009,058,232,691,619,518,384,008,257,988,156,252,546,400,256 (~4.1103168423519E+143 million trillion)
If order matters (e.g. pick3 numbers, permutations, lock combinations, pin-codes): 999,999,810,000,016,638,207,820,352,628,385,997,173,709,672,172,512,375,453,005,393,626,811,245,058,046,104,467,298,631,036,803,052,675,755,154,339,109,034,296,682,959,998,728,930,345,827,013,356,735,443,265,515,570,201,499,557,018,206,208 (~9.9999981000002E+161 million trillion)
If order does not matter (e.g. most lottery numbers): 411,031,684,235,188,459,371,456,620,423,073,960,768,824,329,252,512,727,848,552,906,392,789,991,861,800,284,130,668,495,830,821,507,489,597,998,959,442,811,009,058,232,691,619,518,384,008,257,988,156,252,546,400,256 (~4.1103168423519E+143 million trillion)
If order matters (e.g. pick3 numbers, permutations, lock combinations, pin-codes): 999,999,810,000,016,638,207,820,352,628,385,997,173,709,672,172,512,375,453,005,393,626,811,245,058,046,104,467,298,631,036,803,052,675,755,154,339,109,034,296,682,959,998,728,930,345,827,013,356,735,443,265,515,570,201,499,557,018,206,208 (~9.9999981000002E+161 million trillion)
