The numeral 123 is in some base other than 10. When you change it to base 10, you get 66 base 10. In what base was the numeral 123 written?
Option
(a) 7
(b) 8
(c) 12
(d) 9

• answer will be (a)7
  because (1*7^2)+(2*7^1)+(3*7^0)=49+14+3=66
  so, base will be 7
• 10 years agoHelpfull: Yes(1) No(3)