Question
1221, 1100, 1000,
919, ? What should come in place of question mark (?) in the following number series?Solution
1221 - 11² = 1221 – 121 = 1100 1100 - 10² = 1100 – 100 = 1000 1000 - 9² = 1000 – 81 = 919 919 - 8² = 919 – 64 = 855
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