If one dons ihram for both Hajj and 'umrah and is then prevented, how many hady must he send?

Ibrahim says: He will send two sacrificial animals.

The same is narrated from Ibrahim.

Hazrat Mujahid says: He will send a hady and then come out of ihram.

Hazrat Ata says: There is one Hadi (sacrificial animal) for this.

Hazrat Tawus and Hazrat Ata say that when a person puts on the Ihram for Hajj and Umrah and then falls ill, then one Hadi (sacrificial animal) will suffice on his behalf for Hajj and Umrah.