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19. Find the number of zeros at the end of 73! + 74!

20. Find the number of zeros at the end of
a. 123! + 124!
b. 100! + 101! + 102! + 103!
c. 5^4!*100!

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10 Comments

Comments are closed.

  1. ali zaid 2 years ago

    Very good

  2. Anoop Pandey 2 years ago

    Great sir, what a logical question.

  3. Saurabh Suman 2 years ago

    Seen by gagan pratap and noted

  4. Abhishek Brahman 2 years ago

    Nice

  5. Luwang Meitei 2 years ago

    Hi fren! How are you?

  6. BISHT KULDEEP 2 years ago

    Superb as always sir.

  7. Reygan Dionisio 2 years ago

    Another Way 😀

    1. 123!*(125)
    floor(125/5) = 25
    floor(25/5) = 5
    floor(5/5) = 1

    therefore 31 zeroes.

    2. 100!(1071570)
    floor(100/5) = 20
    floor(20/5) = 4

    24 + 1 = 25
    therefore 25 zeroes.

    3. 100!*5^24
    2^97*5^24*something*5^24

    therefore there are 24+24 = 48 zeroes.

  8. MD DANISH ALAM 2 years ago

    Thank you sir

  9. Yogesh Kumar 2 years ago

    Sir if you could elaborate a little bit more about your course for SSC, such as how to enrol, charges, class hours each day and duration (untill when).

  10. Manoj Pandey 2 years ago

    Sir plz hindi m v smjhaya kijiye.
    thnxx!

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