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descoperiti regula de formare si gasiti toate numerele naturale ce pot urma in fiecare sir a) 666 666, 555 555, 444 444
b) 9 999 991, 9 999 919,9 999 199
c) 666 666, 55 555, 4 444
d) 999 999 991, 99 999 991, 9 999 991