Question
7Â Â Â Â 10Â Â Â Â Â Â 4 Â Â Â Â Â Â 13Â
     ?       16 What should come in place of question mark ‘?’ in the following number series?Solution
7Â +Â 3 = 10 10Â -Â 6 = 4 4Â +Â 9 = 13 13Â -Â 12 =Â 1 1Â +Â 15 = 16
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