Answer : 2
Step-by-step explanation:
Since 3^13 is divisible by 3 and 3^10 is also divisible by 3 which is an odd number
But when an odd number substract an odd number it became even
Example: 9(odd) - 3(odd) = 8(even)
And an even number is always divisible by 2 so 2 is the answer