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cate numere naturale de trei cifre scrise in baza zece sunt egale cu răsturnarea lor : a)81 b) 90 c)9 d)11 Dau coroana

Răspuns :

Forme:aaa,aba=>111,222,333,444,555,666,777,888,999,101,121,131,141,151,161,171,181,191, 202,212,232,242,252,262,272,282,292,303,313,323,343,353,363,373,383,393,404,414,424,434,454,464,474,484,494,505,515,525,535,545,565,575,585,595,606,626,626,636,646,656,676,686,696,707,717,727,737,747,757,787,767,797,808,828,818,838,848,858,868,878,898,909,929,929,939,949,959,969,979,989; b)90