find the next number of the series 20 40 60
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Answered by
0
Answer:
80,100,120,140,160,180,200
Step-by-step explanation:
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Answered by
0
Answer:
80
Step-by-step explanation:
a=20
common difference =20
a4=a+(n-1)d
=20+3*20
20+60
80
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