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google search
Google search results:
1: https://www.javatpoint.com/number-series-1
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2: https://brainly.in/question/19724539
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3: https://brainly.in/question/17689069
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4: https://aptitudekatta.com/problems-on-number-series/
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5: https://www.quora.com/Which-of-the-following-number-will-replace-the-mark-and-complete-the-series-%E2%80%93-60-20-50-30-40-40-30-50
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6: https://quizizz.com/admin/quiz/5e8eb098f8600f001b546102/reasoning
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7: https://iqbrainn.com/logical-reasoning/number-series/
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8: https://www.doubtnut.com/question/-4-which-number-would-replace-the-underline-mark-in-the-series-2040100-820-19704785
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9: https://www.goeduhub.com/1145/number-and-letter-series-questions-set-1
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10: https://app.quizalize.com/view/quiz/mixed-mental-and-physical-ability-96e71662-9173-4e5b-a45b-6e34f8f47e49
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11: http://www.ngmc.org/wp-content/uploads/2019/10/APD_Logical-Reasoning.pdf
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