pqr is a three digit natural number such that pqr = p^3+q^3+r^3. What is the value of r?
a) 0 b) 1 c) 3 d) None of these

• Any armstrong number will follow the above property.
  Like : 153,371
• 12 years agoHelpfull: Yes(11) No(2)
• pqr=153
  153=1+125+27
  so r=3
• 12 years agoHelpfull: Yes(5) No(3)
• pqr=371
  371= 3^3+7^3+1^3= 27+343+1=371
  
  r=1
• 12 years agoHelpfull: Yes(4) No(4)
• it is automorphic no
  hence ans is 3
  1^+5^3+3^3=153
• 12 years agoHelpfull: Yes(2) No(1)