Question

1+2+3....…+100 find the value of each of the following .
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Answer 1

Answer:

5050

Step-by-step explanation:

As the sequence is in AP

a = 1  d = 1  n = 100  S_n = ?

S_n = n/2 ( 2a + (n-1) d )

       = 100/2 [ 2(1) + (100-1) 1]

       = 50 [ 2 + 99 ]

       = 50 * 101

       = 5050