Should I connect one resistor or seven resistors to 7 segment display?

In this video, I've explained how to connect series resistor with 7 segment display, whether only one resistor is enough for limiting the current or should we have to connect resistors with all the segment. Digital Electronics videos (Logic gates, number systems, flip-flop, counters):    • Playlist   ----------------------------------------------------------------------------------------------------------- Other video: Amazing Idea Using RGB LED, video link:    • Bluetooth controlled RGB LED Strip with Ar...   How to make mini amplifier at home, video link:    • How To Make Mini Amplifier Using Only One ...   -------------------------------------------------------------------------------- Facebook:   / digital.debajyoti   Instagram: user name: digital.debajyoti Link:   / digital.debajyoti   ------------------------------------------------------------------------------------------------ You want to support me to make more videos? Support me through Patreon-   / debajyotinath   Support me through PayPal- https://www.paypal.com/paypalme/SanuD...