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Question

If p,q be two prime numbers such that p+q=31, then the possible value(s) of 3p+q is/are
  1. 89
  2. 35
  3. 95
  4. 29


Solution

The correct options are
A 89
B 35
Sum of two digits is odd
One of them should be odd and one should be even.
Let p be even
p=2 then q=29
or q=2 then p=29
3p+q=35 or 89
 

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