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15. Consider the sequence of numbers 6,4,0,4,... where for n>2 the nth term of the sequence is the units digit of the sum of the previous two terms. Let Sn denote the sum of the first n terms of this sequence. What is the smallest value of n for which Sn>2273
A 576 B 571 C 570 D 569

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There are 3 buckets which spaces are 13, 7, 19 liters. The 13 and 7 liters's buckets are filled with milk. and 19' is empty. So you have to count 10 liters in any bucket without any equipment. Given statements: 1st and 2nd numbers are 1 and 2 respectively.
the 5th number is 5