77 + 88 - 99 + 10!!
= 77 + 88 - 99 + ( 10 × 8 × 6 × 4 × 2 )
= 77 + 88 - 99 + ( 80 × 6 × 4 × 2 )
= 77 + 88 - 99 + ( 480 × 4 × 2 )
= 77 + 88 - 99 + ( 1.920 × 2 )
= 77 + 88 - 99 + 3.840
= 165 - 99 + 3.840
= 66 + 3.840
= 3.906
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77 + 88 - 99 + 10!!
= 77 + 88 - 99 + ( 10 × 8 × 6 × 4 × 2 )
= 77 + 88 - 99 + ( 80 × 6 × 4 × 2 )
= 77 + 88 - 99 + ( 480 × 4 × 2 )
= 77 + 88 - 99 + ( 1.920 × 2 )
= 77 + 88 - 99 + 3.840
= 165 - 99 + 3.840
= 66 + 3.840
= 3.906