Question

Each of the digits in the number 34135278 is arranged in ascending order from left to right. The position of how many digits will remain unchanged as compared to that in the original number?

• A. 2
• B. 3
• C. 1
• D. 4

Answer 1

Answer:

B. 3

The position of 3 digits will remain unchanged.

1. Original Number:
   3 4 1 3 5 2 7 8

2. Arranged in Ascending Order:
   1 2 3 3 4 5 7 8

3. Comparison:

   • 1st digit: 3 $\rightarrow$ 1 (Changed)

   • 2nd digit: 4 $\rightarrow$ 2 (Changed)

   • 3rd digit: 1 $\rightarrow$ 3 (Changed)

   • 4th digit: 3 $\rightarrow$ 3 (Unchanged)

   • 5th digit: 5 $\rightarrow$ 4 (Changed)

   • 6th digit: 2 $\rightarrow$ 5 (Changed)

   • 7th digit: 7 $\rightarrow$ 7 (Unchanged)

   • 8th digit: 8 $\rightarrow$ 8 (Unchanged)

The digits that remain in the same position are the second 3, 7, and 8.