Math, asked by kookie34, 3 months ago

Find the sum of the following one :
2+4+6+8+___+40=
Equation = Sn=n(n+1)

Answers

Answered by punank89

2

Answer:

420

Step-by-step explanation:

an=a+(n_1)d

40=2+(n_1)2

40=2n

n=20

sn =n/2(a+l)

=10(2+40)

=10×42

420

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