UPSC CSAT Number System PYQ || CSAT 2022 - Number System 3 | Best Tricks & Shortcuts

UPSC CSAT 2024 Prep || CSAT 2022 - Number System Session 3 | Best Tricks & Shortcuts for Difficult Problems #csat #upsc #upscprelims
In this video,
We will discuss a few previous year's questions from UPSC CSAT 2022 based on the topic of the Number System. We will solve the question with the best shortcuts and tricks while understanding the concepts in the case of each question.
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CSAT 2022 Questions Discussed in the video:
1. There is a numeric lock which has a 3-digit PIN. The PIN contains digits 1 to 7...How many maximum attempts does one need to find out the PIN with certainty?
2. An identity card has the number ABCDEFG, not necessarily in that order, where each letter represents a distinct digit (1, 2, 4, 5, 7, 8, 9 only). The number is divisible by 9....Which of the following is a possible value for the sum of the middle three digits of the number?
3. The digits 1 to 9 are arranged in three rows in such a way that each row contains three digits, and the number formed in second row...how many such combinations are possible to be arranged in the three rows?