Provide your solutions to the following Countdown problems:

a$.$ Your six initial numbers are $75,7,3,2,4,1$ and your target number is $325.$

b$.$ Six numbers are $99,33,30,13,12,10$ and the target is $35.$

c$.$ Six numbers are $30,13,7,5,2,1$ and the target number is $210.$

The "rules" for each algorithm are:

You do not have to use all the initial numbers, but each may be used once only as an immediate value.

You may use as many registers as you wish, but you may use each register only once as the destination register, and then only once as a source

register $($i$.$e$.$ as an argument$).$

You may use only the operations introduced so far in class. $($i$.$e$.$ MOV $,$ ADD, SUB, LSL $,$ LSR $)$