Edit: This was from the first question in today’s exam on interest rate collars and options. We were given 2 strike prices and for one strike price, there were no premiums given for the call options, whereas the other strike price had no premiums available for the put options.
I will not see today’s exam for some time, although it seems strange not to have been given the premiums. Maybe it was because you only needed the call option for one strike price and the put option for the other one.
However until I have seen the question I cannot really say any more.