Question

First term 30;the sum of first three term is 300

Answer 1

Answer:

Sn=n/2(2a+(n-1)×d)

n=3,Sn=300,a=30

300=3/2(60+(2)d)

600=3(60+2d)

200=60+2d

200-60=2d

140=2d

d=70

Step-by-step explanation:

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