Instructions

What will come in place of the question mark (?) in the following number series?

Question 145

5120, 1280, 320, 80, ?

Solution

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4 is divided from each number

5120 $$\div 4$$ = 1280

1280 $$\div 4$$ = 320

320 $$\div 4$$ = 80

80 $$\div 4$$ = 20

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