Question

what is the sum of all natural numbers from 1 to 100 ?​

Answer 1

Answer:

5050

Step-by-step explanation:

This is an arithmetic series, for which the formula is:

S = n[2a+(n-1)d]/2

where a is the first term, d is the difference between terms, and n is the number of terms.

For the sum of the first 100 whole numbers:

a = 1, d = 1, and n = 100

Therefore, sub into the formula:

S = 100[2(1)+(100-1)(1)]/2 = 100[101]/2 = 5050

Answer 2

Sum of the 1 to 100 numbers is

n(n+1)/2

100×(100+1)/2

100 ×101/2

50×101

5050