What is the formula to calulate "How many messages we could transmit for a given number of bits?", and how does it differ from the formula for "How many messages we could transmit for a given number of bits?"

The formula is the reverse of the formula for "How many messages we could transmit for a given number of bits?"

I  =	B^n
log (I) =	n * log (B)
n =	log (I)   log (B)