What is the sum of natural numbers between 90 and 100
Pick:  A) 1045  B) 4860  C) 5000  D) 5500  E) 5550
a = first number   l = last number   Sn = n/2[a + l]   between 90 and 100 numbers = 11 =&gt; 100 - 90= 
<gadget id="calculator">100 - 90</gadget>
<output>10</output>
10 + 1= 
<gadget id="calculator">10 + 1</gadget>
<output>11</output>
11   Sn= 11/2 Ã— 190 = 11 Ã— 95 = 1045   1045nswer : 1045
<result>A</result>
What is the sum of natural numbers between 90 and 100