Instructions

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

Question 124

2890, (?), 1162, 874, 730, 658

Solution

Numbers of the form $$(72 \times 2^n)$$ is subtracted where n is whole number

2890 $$- 72 \times 2^4$$ = 1738

1738 $$- 72 \times 2^3$$ = 1162

1162 $$- 72 \times 2^2$$ = 874

874 $$- 72 \times 2^1$$ = 730

730 $$- 72 \times 2^0$$ = 658


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