a. B, C are three different prime numbers, and a B = 33, B C = 34, c d = 66, find a

a+b=33,
33 is odd
So a and B have an even number
B + C and C + D are even numbers
So BCD is odd
So a is even
So a = 2
b=33-a=31
c=34-b=3
d=66-c=63

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