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Growth patterns and figurate numbers
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4-point ladder

Growth patterns and figurate numbers, 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.

0/5 solved

KA-0030

about 75s

A sequence starts 4, 7, 10, 13 and continues in the same way. What is the 20th term?