Complete the series 840, 168, 42, 14, 7, ?
\[ 840 \div 5 = 168 \] \[ 168 \div 4 = 42 \] \[ 42 \div 3 = 14 \] \[ 14 \div 2 = 7 \] \[ 7 \div 1 = 7 \] So, the missing number is 7.
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