Question

20,40,80,160,320,?,?
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Answer 1

Answer:

640

Explanation:

As 40 is the double of 20,

80 is double of 40

160 is the double of 80

320 is the double of 160.

so 640 is the double of 320

Answer 2

Answer:

640, 1280

Explanation:

20×2=40

40×2=80

80×2=160

160×2=320

320×2=640

640×2=1280

Hope it helps...