Question

the sum of the first 20 natural numbers is​

Answer 1

1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 + 11+ 12 + 13 + 14 + 15 + 16 + 17 + 18 + 19 + 20 = 210

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Answer 2

Answer:

210

Step-by-step explanation:

a1=1, a2=2,n=20, last term (l)=20

Difference (d)=a2-a1=2-1=1

Sn=n/2 (a+l)

S20=20/2 (1+20)

S20=10×21

S20=210