what is the sum of first 20 natural numbers
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Answered by
4
Answer:
Answer is 210
Step-by-step explanation:
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Answered by
8
Step-by-step explanation:
S20=?
The natural numbers are 1, 2, 3, 4......
a=1
d=2-1=1
We know,
Sn=n/2[2a+(n-1)d]
S20=20/2[2×1+(20-1)1
=10[2+19]
=10[21]
=210
The sum of 20 natural numbers is 210.
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