Answer:
A minimum of 4 bits will be needed.
Step-by-step explanation:
As there are 12 months in a year so will need 12 need combinations.
Number of bits can be determined by the powers of 2. By this we mean:
 
 Two unique combinations can be made that are 0 and 1.
 
 4 unique combinations can be made.
 
 8 unique combinations can be made.
 
 16 unique combinations can be made.
 
Now we will have to use 4 bits so that 12 unique combinations may be assigned to each month.
Following is given the bit pattern for each month:
JANUARY => 0000 
FEBRUARY => 0001 
MARCH => 0010 
APRIL => 0011 
MAY => 0100 
JUNE => 0101 
JULY => 0111 
AUGUST => 0110 
SEPTEMBER => 1000 
OCTOBER => 1001 
NOVEMBER => 1010 
DECEMBER => 1011
i HOPE IT WILL HELP YOU!