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Unit Digits and Last Two Digits

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Dear students,

Solve this question.

What is the unit digit of the product 

71.72.73.74.……………..72020

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

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amazing

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