The sum of first 20 even natural numbers is *
Answers
Answered by
1
Answer:
78
Step-by-step explanation:
First 20 even natural numbers are:
2,4,6,8,10,.....
a = 2 ; d = 2 ; n =20
We know that, Sum of n terms =
So,
= 10 × 4 + 38
= 40 + 38
= 78
Therefore, The sum of first 20 even natural numbers is 78...
hope it helps.
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Answered by
2
The number series 2, 4, 6, 8, 10, 12, . . . . , 40. Therefore, 420 is the sum of first 20 even numbers.
a= 2
d = 2
n= 20
an= a + (n-1) d
an = 2 + ( 20 -1) 2
= 2+(19)x 2
= 2 + 38
= 40
S = n/2 (a + an)
S = 20/2 ( 2 + 40)
S= 10 x 42
S = 420
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