Question

Sn = 1 +2 +3+.......+999
how many terms are there​

Answer 1

Answer:

Summing 1+2+3+……+999+1000 is:

The sum is

s = 1 + 2 + 3 + 4 + 5 + ... + 1000

Add:

s = n(n + 1)/2

Now,

s = 1000(1000 + 1)/2

s = 500(1001)

s = 500,500

The answer of 1+2+3+……+999+1000 is 500500.

Answer 2

999

Step-by-step explanation:

Let an =999 where n represents number of a term

Then by general term formula for Arithmetic progression

An=a1+(n-1)d

999=1+(n-1)1

999-1=n-1

998+1=n

999=n