Question

2
What is the sum of first 20 natural numbers?




....plz answer as soon as u can​

Answer 1

Answer:

The difference between the first 20 numbers is 1. Hence, we can use arithmetic progression (AP)

The formula is $\frac{n}{2}$ × $(highest+lowest$ $term)$

= $\frac{20}{2}$ × $(1+20)$

= $10$ × $21$

= $210$

Hence, the sum of the first twenty natural number is 210.

NOTE: We can only use arithmetic progression when the difference between the terms is equal.

Hope it helps

Answer 2

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=first 20 natural numbers are=1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20

sum of 1st 20 natural numers= =1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20

=210

hope it helps :)

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