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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 $ 12^{th}$ digit from the left and the $ 2^{nd}$ digit from the right?
13
14
12
15
13
Count positions from both ends: 12th from left means counting 12 digits starting from index 0; 2nd from right means the second last digit.
Count positions from both ends: 12th from left means counting 12 digits starting from index 0; 2nd from right means the second last digit.
Locate the 12th digit from the left
Counting from the left: 5(1), 5(2), 4(3), 1(4), 6(5), 2(6), 7(7), 3(8), 8(9), 7(10), 4(11), 6(12). The 12th digit is 6.
Locate the 2nd digit from the right
Counting from the right: 3(1st), 7(2nd). The 2nd digit from the right is 7.
Calculate the sum
Sum = 6 + 7 = 13.
B: 12 is incorrect, C: 14 is incorrect, D: 15 is incorrect; 13 is the only mathematically correct sum.
A is correct because the 12th digit from the left is 6 and the 2nd digit from the right is 7, making the sum 6 + 7 = 13.
Always verify the starting end (left vs right) as counting errors are the most common cause of negative marks in sequence questions.
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