Explanation:

Let’s break it down step by step.

Given set:

10, 6, 25, 4, 1

Rules summary:

- 6 is divisible by 3; 10, 25, 4, 1 are not.

- Divisible by 3 ?

- Odd number next: multiply.

- Even number next: add.

- Not divisible by 3 ?

- Odd number next: subtract smaller from larger.

- Even number next: add.

Now, let's process the numbers, moving left to right:

1. 10 and 6:

- 10 is not divisible by 3, 6 is even.

- Rule: not divisible + even ? add.

- 10 + 6 = 16

2. Now 16 and 25:

- 16 not divisible by 3, 25 is odd.

- Rule: not divisible + odd ? subtract smaller from larger.

- 25 - 16 = 9

3. Now 9 and 4:

- 9 is divisible by 3, 4 is even.

- Rule: divisible + even ? add.

- 9 + 4 = 13

4. Now 13 and 1:

- 13 not divisible by 3, 1 is odd.

- Rule: not divisible + odd ? subtract smaller from larger.

- 13 - 1 = 12

Final resultant for the set: 12

The question says “resultants of the given sets” but there’s only one set. Maybe it’s asking what’s the unit digit of this number: 12

Unit digit: 2

Option 1, 2 is the correct option.

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Quick Takeaways:

- Follow the rules left to right with each pair.

- Keep updating the result with each new number.

- End result is 12, units digit is 2.

- Option 1 is your pick, that matches our logic.

That's all there is to it!