Sum of squares of digit is 50 and left digit is greater than right digit. Find…

2024

Sum of squares of digit is 50 and left digit is greater than right digit. Find the highest product of digit.

  1. A.

    3

  2. B.

    7

  3. C.

    2

  4. D.

    4

Attempted by 30 students.

Show answer & explanation

Correct answer: B

Answer: 7

Let the left digit be x and the right digit be y. We are given x^2 + y^2 = 50 and x > y.

  • Check possible digit squares (0 through 9): 0, 1, 4, 9, 16, 25, 36, 49. The only combinations that sum to 50 are 49 + 1 and 25 + 25.

  • 49 + 1 corresponds to digits 7 and 1; 25 + 25 corresponds to digits 5 and 5.

  • The pair with equal digits (5 and 5) does not satisfy x > y, so it is not allowed. Therefore the only valid digits are x = 7 and y = 1.

  • Compute the product: 7 × 1 = 7. Since this is the only valid pair, 7 is the required (and highest) product.

Final answer: 7

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