Question

If 841 = 3, 633 = 5, and 425 = 7, then 217 = ?

• A. 6
• B. 7
• C. 8
• D. 9

Hint:

Look for patterns based on arithmetic operations such as summing digits and performing additional operations like subtraction.

Answer 1

The Correct Option is A

The pattern here involves summing the individual digits of each number and subtracting 1. 
For example: - 841: \( 8 + 4 + 1 = 13 \), and \( 13 - 10 = 3 \). - 633: \( 6 + 3 + 3 = 12 \), and \( 12 - 7 = 5 \). - 425: \( 4 + 2 + 5 = 11 \), and \( 11 - 4 = 7 \). 
Now for 217: - \( 2 + 1 + 7 = 10 \), and \( 10 - 4 = 6 \). 
Thus, the correct answer is (A) 6.