Question

what will be the sum of the first 20 even numbers​

Answer 1

Answer:

420

Step-by-step explanation:

just add don't need to tell you

Answer 2

Answer:

420

Step-by-step explanation:

the number series 2,4 6,8,10,12,....40

the first term a=2

the common difference d=2

SUM = N/2×(a+Tn)

20/2 × (2+40)

(20×42)/2

840/2

2+4+6+8+10+12+20......+40=420

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