Question

Find the value of 11 +22+33 + ... + 1100.

Answer 1

sum of terms: 55550

Step-by-step explanation:

`\sf S_n = (n)/(2) (u_(start)+u_(end)})`

Here the number of terms:

1100 ÷ 11 = 100

Using the Formula:

`\sf (100)/(2) (11+1100)`

`\sf 55550`