Question
351Â Â Â 261Â Â Â 181Â Â Â 111Â Â Â 51Â Â
 ? What will come in place of the question mark (?) in the following series?Solution
351 – 90 = 261 261 – 80 = 181 181 – 70 = 111 111 – 60 = 51 51 – 50 = 1
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