RRB NTPC CBT-1 previous year question
If 1 is added to each odd digit and 1 is subtracted from each even digit in the number 7254136, how many digits will appear more than once in the new number thus formed?
Asked in RRB NTPC 2026 — 18 June Shift 2 · Reasoning
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Correct answer: (A) None
Adding 1 to each odd digit and subtracting 1 from each even digit of 7254136 gives 8,1,6,3,2,4,5 — all seven digits are distinct, so none of them appear more than once.
हिंदी में प्रश्न
यदि संख्या 7254136 के प्रत्येक विषम अंक में 1 जोड़ा जाए तथा प्रत्येक सम अंक में से ॥ घटाया जाए, इस प्रकार बनी नई संख्या में कितने अंक एक से अधिक बार आएंगे?
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उत्तर और व्याख्या देखें
सही उत्तर: (A) एक
7254136 के प्रत्येक विषम अंक में 1 जोड़ने और प्रत्येक सम अंक में से 1 घटाने पर 8,1,6,3,2,4,5 मिलता है — सभी सात अंक भिन्न हैं, इसलिए कोई भी अंक एक से अधिक बार नहीं आता।
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