The minimum number of seismographs needed to locate an epicenter of an earthquake is 3.
The minimum number of seismic stations needed to determine the location of an earthquake's epicenter is THREE.
The minimum number of seismic stations needed to determine the location of an earthquake's epicenter is THREE.
The minimum number of seismic stations needed to determine the location of an earthquake's epicenter is THREE.
The minimum number of seismic stations needed to determine the location of an earthquake's epicenter is THREE.
3
3
270 electoral votes are needed to win the presidency.
100
Four planes.
3 or 4
Quorum