5 2 4 1 9 8 7 4 6 5 1 3 8 2 4 1 3 9 2 1 6 8 7 5 1 What is the difference…
2025
5 2 4 1 9 8 7 4 6 5 1 3 8 2 4 1 3 9 2 1 6 8 7 5 1
What is the difference between the numbers from the numbers seventh from the left end 11th from the right end?
- A.
4
- B.
3
- C.
1
- D.
2
Attempted by 1116 students.
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Correct answer: B
Solution:
The sequence is: 5 2 4 1 9 8 7 4 6 5 1 3 8 2 4 1 3 9 2 1 6 8 7 5 1
Find the seventh number from the left: counting from the left gives the 7th number = 7.
Find the eleventh number from the right: there are 25 numbers, so the 11th from the right is the (25 − 11 + 1) = 15th from the left, which is 4.
Compute the difference: 7 − 4 = 3.
Answer: 3