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Last-digit behavior of products and powers
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4-point ladder

Last-digit behavior of products and powers, 4-point ladder

●●○4 points, difficulty 2 of 34 pt

Two steps, or one step plus a trap.

3 in a row to finish this ladder.

0/2 solved

KA-0053

about 105s

What is the remainder when 2 to the power 30 is divided by 7?