What is the value of :

$10 + 20 + 30 + \ldots + 190 + 200 ?$

The answer is 2100.

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$A=10+20+30+...+190+200$

$A=10 \times (1+2+3+...+19+20)$

$A= 10\times 210 = \boxed{2100}$