Question
398Â Â Â 308Â Â Â 228Â Â Â 158Â Â Â 98Â Â
 ? What will come in place of question mark (?) in the following number series?Solution
398 – 90 = 308 308 – 80 = 228 228 – 70 = 158 158 – 60 = 98 98 – 50 = 48
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