Question

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please answer it​

Answer 1

Answer:

a =4

•a+3d=0

•a=−3d

=a+24d=3(a+10d)

a25=−3d+24d

a25 =21d------ (1)

a11=a+10d

a11=−3d+10d

a11 =7d---- (2)

From equation (1) and (2), we get

••••a25=3a11

Hence proved.