1.

If P is the number of natural numbers whose logarithms to the base 10 have the the charecteristic p and Q is the numbers of natural numbers logarithms of whose reciprocal to the base 10 have the charecteristics -q. then find the value of `log_(10) P-log_(10) Q`

Answer» `10^p<=p<10^(p+1)`
`p=10^(p+1)-10^p`
`=10^p*q`
`=9.10^p`
Simialrly,
`10^(q-1)ltQ<=10^q`
`Q=10^q-10^(q-1)`
`=9*10^(q-1)`
`log_10^p-log_10^Q=log_10^(p/q)`
`log_10((9*10^p)/(9*10^(q-1)))`
`log_10 10^(p-q+1)=p-q+1`.


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