Question

Please can u find this.
1+2+3+4+5........+1000?​

Answer 1

Step-by-step explanation:

Sn = 1000/2 ( 1+1000) = 500× 1001 = 500500

Formula = Sn = n/2(a+l)

Answer 2

$\bold \green{\underline {Step\:by\:step\:explanation:-}}$

$\implies SN = \frac{1000}{2} (1 + 1000)$

$\implies 500 \times 1001 = 500500$

$\implies Formula = SN = \frac{n}{2} (a + l)$