Find missing number in 1, 40, 60, ?, 100 series - PuzzlersWorld.com

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Find missing number in 1, 40, 60, ?, 100 series - PuzzlersWorld.com

Find missing number in 1, 40, 60, ?, 100 series - PuzzlersWorld.com
Find missing number in 1, 40, 60, ?, 100 series - PuzzlersWorld.com