2 years ago

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

1 answer:

saw5 [17]2 years ago

3 0

Answer:

4905

Step-by-step explanation:

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

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