Answer-150 160 140 ? 130 180

150 10 160 160 ndash 20 140 140 30 170 170 ndash 40 130 130 50 180

Question

150 160 140 ? 130 180

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

A 120

B 140

C 150

D 170

E None of these

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