The difference between the ages of two brothers is a prime n

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IB ACIO Grade II Previous Paper 3 (Held On: 15 Sept 2013
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The difference between the ages of two brothers is a prime number. Sum of their ages is also a prime number. If the elder brother is 28 years old. How many different values can the age of the younger brother take?

[IB ACIO Grade II Previous Paper 3 (Held On: 15 Sept 2013]

A

2

B

3

C

4

D

1