exam Maths Puzzle Numerical Ability

wich number is a prime number
1
12
31
99

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exam Other Question

If x is the sum of all prime factors of 38, and if y is the sum of all prime factors of 84, what is the value of x-y? Please explain prime factors. can somone plese help me solve this?
log(9, sqrt x ) + log(9, sqrt 2x+3)=1/2