A certain sum becomes Rs. 2,356 in 3 years and Rs. 2,660 in 5 years on simple interest. The value of the sum is:

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1. **Calculate the difference in interest:**  
   - Interest for 5 years = Rs. 2,660 - Principal  
   - Interest for 3 years = Rs. 2,356 - Principal  
   - Difference in interest over 2 years: $$2,660 - 2,356 = 304$$.

2. **Find the annual interest:**  
   - Annual interest = $$\frac{304}{2} = 152$$.

3. **Calculate the principal (sum):**  
   - From the amount after 3 years:  
     $$	ext{Principal} = 2,356 - (3 	imes 152) = 1,900.$$

Thus, the value of the sum is **Rs. 1,900**.

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