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Sauron [17]
3 years ago
10

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

Mathematics
1 answer:
saw5 [17]3 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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