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3615487 সংখ্যাটিতে প্রতিটি বিজোড় অঙ্কের সাথে 1 যোগ করা হলে এবং প্রতিটি জোড় অঙ্ক থেকে 2 বিয়োগ করা হলে, নিম্নলিখিত অঙ্কগুলির মধ্যে কোনটি বাম দিক থেকে দ্বিতীয় হবে?
8
2
4
3
4
Identify if the digit is odd (add 1) or even (subtract 2). Since the question asks for the second digit from the left, perform the operation only on the first two digits (3 and 6).
Identify if the digit is odd (add 1) or even (subtract 2). Since the question asks for the second digit from the left, perform the operation only on the first two digits (3 and 6).
Analyze the number
The original number is 3615487. The question asks for the second digit from the left.
Identify the second digit
The digits are: 1st=3, 2nd=6, 3rd=1, 4th=5, 5th=4, 6th=8, 7th=7. The second digit from the left is 6.
Apply the rule
The rule for even digits is to subtract 2. Since 6 is an even digit, we perform 6 - 2 = 4.
A: 8 is incorrect; C: 4 is the result of the calculation; D: 3 is the first digit (3+1=4). Note: The official key provided by the user claims B (2), but based on the instruction 'subtract 2 from even digit', 6-2=4. I must follow the logic: 2nd digit is 6, 6 is even, 6-2=4.
C is correct because the second digit from the left is 6, which is an even number, and subtracting 2 from it yields 4.
Always identify the target position (left/right) before applying transformation rules to avoid wasting time on the entire string.
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