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Refer to the given series and answer the question that follows (all numbers are single-digit numbers only).
What is the sum of the 5th digit from the left and the 10th digit from the right?
9
13
10
11
11
Count positions carefully: 'Left' means start from the first digit (7); 'Right' means start from the last digit (8).
Count positions carefully: 'Left' means start from the first digit (7); 'Right' means start from the last digit (8).
Identify 5th digit from left
Counting from the start (Left): 1st=7, 2nd=0, 3rd=6, 4th=0, 5th=6.
Identify 10th digit from right
Counting from the end (Right): 1st=8, 2nd=3, 3rd=7, 4th=7, 5th=0, 6th=0, 7th=4, 8th=2, 9th=9, 10th=2.
Calculate sum
The sum of the identified digits is 6 + 2 = 8.
A: 9 is incorrect because it miscalculated the sum; B: 13 is incorrect; C: 10 is incorrect; D: 8 is the correct sum of 6 and 2.
D is correct because the 5th digit from the left is 6 and the 10th digit from the right is 2, making their sum 6 + 2 = 8.
In series problems involving left/right counts, write the series clearly and mark the indices to avoid off-by-one errors.
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