Did the Abbasids take power from the Umayyads in 749 AD?

The Abbassids took power from the Umayyads in 750 C.E. (one year later). There was a coup d'├ętat by the Abbassids against the Umayyads to take the power.

Yes because the Rashidun Caliphate started at 632 AD and ended in 661 AD so the Umayyad caliphate started and the Umayyad caliphate ended in 749 AD so the Abbasid Caliphate start....