Question
1Â Â Â Â Â 1Â Â Â Â Â Â 4 Â Â Â Â Â Â ?Â
     280       3640 What should come in place of question mark ‘?’ in the following number series?Solution
1 × 1 = 1 1 × 4 = 4 4 × 7 = 28 28 × 10 = 280 280 × 13 = 3640
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