Question

What will be the common difference of Arthemitc progression ,whose sum of first m terms is given 2(m^2+3m)

Answer 1

Answer:

εηηο!

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We know that

Sm -Sm-1 =am

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Sm =2(m^2+3m)

let m=1

S1=2(1+3)

S1=8

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S2-S1=a2

a2 =[2(4+6)]-8=20-8=12

Similarly,

a3=S3 -S2

=>2(3^2+3 x 3)

=>36-20

=>16

hope helps you❤

Answer 2

Step-by-step explanation:

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