The sum of all the 2 digit numbers is .. plz give explanation too

asked Aug 25, 2020 81.7k views

3 votes

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6 votes

Answer:

4905

Explanation:

$Sn= ((a_1+a_n))/(2)*n\\\\Sn = (10+99)/(2)*90 = 4905$

IturPablo answered Aug 31, 2020

5.9k points

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