Two input capture events occur at counts 0x1037 and 0xff20 of the free-running counter. how many counts, in decimal have transpired between these two events?
a. 25,891
b. 57, 421
c. 61,161
d. 64, 551

The correct answer is C.

Explanation:

You have to do 0xFF20 - 0x1037 but first, you need to convert the counts from hexadecimal base system to decimal base system using this formula:

, where position of the x₀ is the rightmost digit of the number.

Note:

0xFF20 = 15*16³+15*16²+2*16¹ = 65312

0x1037 = 1*16³+3*16¹+7*16⁰ = 4151

Result: 65312 - 4151 = 61161