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a fost răspuns

hellooooStie cineva la astea1) card B ,unde B ={ x E IN* I x < 1000}

2) abcd, unde a, b ,c si d sunt numere naturale consecutive

Răspuns :

Deva
1)B={1,2...999}
cardB=999
2)1234,2345,3456,4567,5678,6789,9876,8765,7654,6543,5432,4321,3210