Khulafa'ul-Rashidun are in number.

The term Khulafa'ul-Rashidun refers to the Rightly Guided Caliphs, who are considered the first four leaders after the death of Prophet Muhammad (peace be upon him) in early Islamic history. These leaders are recognized for their just and effective governance. The Khulafa'ul-Rashidun are:

• Abu Bakr (r.a.), who served as the first caliph.
• Umar ibn al-Khattab (r.a.), the second caliph known for his administrative acumen.
• Uthman ibn Affan (r.a.), the third caliph recognized for compiling the Quran.
• Ali ibn Abi Talib (r.a.), the fourth caliph known for his wisdom and knowledge.

Thus, the correct number of Khulafa'ul-Rashidun is four.