Question

which of the following cannot be the sum of two prime numbers?
a)7
b)23
c)19
d)31

Answer 1

Answer:

c

Step-by-step explanation:

Answer 2

23 cannot be the sum of two prime numbers. Thus Option B is correct

Solution:

Prime numbers are the numbers which have exactly two factors i.e. It can completely be divisible by itself and 1

All prime numbers are odd, except 2 which is the only even prime number. These are

2,3,5,7,11,13,17,19,23,29 and so on

If we look at the options,

a) 7 can be obtained from two prime numbers  5 and 2

b) From above prime numbers we can see 23 is not a combination of any two prime number

c) 19  can be obtained from two prime numbers  17 and 2

d) 31 can be obtained from two prime numbers 29 and 2  

Hence, 23 cannot be the sum of two prime numbers

Learn more about prime numbers

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