Question

2+4+6+8............20=??solve using a.p​

Answer 1

Answer:

Step-by-step explanation: sum of ap = n/2(2a+(n-1)d

a=2 : l=20

l =a+(n-1)d

20=2+(n-1)2

n=10

Sn =10/2(2*2)+10-1)2

5(4+9*2)

5(4+18)

Sn = 110

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