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APPSC Group-I Prelims 2024 Paper II · Question 45

Question 45 of the APPSC Group-I Prelims 2024 Paper II (17 March 2024). Try it first, then open the answer and explanation.

  1. Prelims 2024 · P-II · Q45 · Mental Ability & Reasoning · Numbers & Series

    Chandra is a confused typist. While typing the numbers from 600 to 799 (both included), he typed 8 wherever he was supposed to type 6. Then the total number of times he had typed 8 is :

    1. 180
    2. 230
    3. 320
    4. 300

    చంద్ర గందరగోళంలో ఉన్న ఒక టైపిస్ట్. 600 నుండి 799 వరకు ఉన్న సంఖ్యలను టైప్ చేస్తున్నప్పుడు (రెండూ కలుపుకొని), అతను 6 టైప్ చేయాల్సిన చోట 8 అని టైప్ చేశాడు. అప్పుడు అతను 8 సంఖ్య ను టైపు చేసిన మొత్తం సంఖ్య :

    1. 180
    2. 230
    3. 320
    4. 300
    Show answer

    Answer: (1) 180

    సమాధానం: (1) 180

    From 600 to 799 the digit 6 appears 100 times in the hundreds place (600-699), 20 times in the tens place and 20 times in the units place, a total of 140. The digit 8 itself appears 20 + 20 = 40 times (tens and units), so he typed 8 a total of 140 + 40 = 180 times.

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