V V V V EasyA code of 3 distinct digits selected from (0, 1, 2, 3, . . . 9) is formed such that the first digit is not-zero. The code should be such that when read upside down it should not create any confusion. How many distinct codes are possible? (Assume that the digits 0, 1, 6, 8 and 9 would still appear as proper digits when seen upside down.) a)606 b)612 c)618 d)648

1) 1
2) 2
3) 3
4) 4

• 606
  
  total possible codes = 9*9*8= 648
  Numbers which may create confusion = 4*4*3=48
  But 609,906,619,916,689 and 986 will not create confusion as they appear same in both ways.
  so total codes = 648-48+6=606
• 11 years agoHelpfull: Yes(1) No(0)