Question

2+4+6+8+.....sum of first 20 even positive integer is​

Answer 1

Answer:

420

Step-by-step explanation:

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Answer 2

Answer:

420

Step-by-step explanation:

2+4+6+8+....

this forms an A.P

here,

a= 2 , d = 2 , n = 20 , A n = ?

now,

we have to find Sn

Sn = n/2 ×[2a +( n- 1) d]

Sn =20/2×[2×2+(20-1) 2]

Sn = 10×[4+19 ×2]

Sn= 10×[4+38]

Sn = 10×42

Sn=420

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