Others Maths Puzzle

the no. of digits in the product of 9 11-digit number can never be:
1>90
2>93
3>95
4>99

Read Solution (Total 1)

Maximum of 11 digit number is x=(99999999999)^9
log x=log(99999999999)^9
log x=9*(log(11111111111*9))
log x=9*(log 11111111111 + log 9)
log x=9*((10.1023)+ 0.9)
log x=90.9207+8.1
log x=99.0207
12 years agoHelpfull: Yes(0) No(0)

Others Other Question

If 45-45=45 ,we can prove it ? A grandma has many sons; each son has as many sons as his brothers. What is her age if it?s the product of the no: of her sons and grandsons plus no: of her sons?(age b/w 70 and 100).