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Unit Digits and Last Two Digits

 
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March 10, 2018 11:05 AM
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Dear students,

Solve this question.

What is the unit digit of the product 

71.72.73.74.……………..72020

Anonymous 
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71.72.73.74.……………..72020

= 7(1 + 2+ 3+ ………….2020)

=72020(2020+1)/2 = 71010 x 2021

When 1010 x 2021 is divided by 4 gives remainder = 2 x 1 =2

Unit digit = 72 =>9

By ritika.juneja101 March 14, 2018 6:43 PM
 
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April 22, 2024 3:27 PM

amazing

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July 5, 2024 8:23 AM

very

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September 25, 2024 3:32 PM

èdczx

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