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Answer: Option 3
Sum first n natural numbers $${\text{ = }}\left[ {\frac{{{\text{n(n + 1)}}}}{2}} \right] = 25 \times 13$$ Sum of first 25 natural numbers $${\text{ = }}\frac{{25(26)}}{2} = 25 \times 13$$ Now check option Clearly, we can see 13 is factor So, '13' is answer
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