Question

what will the sum of 1 to 100 all numbers​

Answer 1

Answer:

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

n=100

a=1

d=1

so S100= 100/2(2(1)+(100-1)1)

= 50(2+99)

=50(101)

=5050

Step-by-step explanation:

Answer 2

Sum of the 1 to 100 numbers is

n(n+1)/2

100×(100+1)/2

100 ×101/2

50×101

5050