Question
10Â Â Â 11Â Â Â Â 12Â Â Â Â 20Â Â Â Â 24Â
   ? What should come in place of the question mark (?) in the following number series?Solution
10 + 13Â Â =11 11 +12Â =12 12 +23 =20 20 +22 =24 24 + 33 = 51
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