Complete the series 9, 10,18, 57, 224, ?, 6744.

Question

On behalf of Sture Sjöstedt

Answer 1

1125

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9, 10,18, 57, 224, 1125, 6744

9*1+1=10
10*2-2=18
18*3+3=57
57*4-5=224
224*5+5=1125
1125*6-6=6744