OPA2837: MTBF/FIT calculation

Part Number: OPA2837

Tool/software:

Hi, 

I recalculated the MTBF/FIT for component OPA2837IDGKT and it is returning half of the value given by the reliability datasheet.

I believe the equation used by TI is missing a division by 2. Can you please confirm which number is correct?

I have calculated FIT for other TI's part, and looks like my equations are correct. See below:

Thank you.

Ede.