Let's check out, is mental math really imp. for excelling in entrance exams?
https://www.qdspro.com/blog/how-important-is-mental-math-for-exams-like-gmat-and-cat/
So True ! Kindly like, share and subscribe if you too agree !
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1. In how many ways can 4 rings be worn in the index, ring finger and middle finger if there is no restriction of the number of rings to be worn on any finger?
Ans 3*3*3*3
2. In how many ways can 3 different rings be work in 4 fingers given that one is allowed to wear more than one ring in finger?
7c3*3!
Why two different methods are used?
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Question N. - 15 - Kitabee
A natural number N when divided by a certain divisor leaves a remainder of 19. If twice the number is divided by the same divisor, then the remainder is 7. Which of the following is true? a) N lies between 10 and 20. b) N can only be 50. c) The divisor is 31. Your answer is correct d) Both (B) and (C).
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IMO EG is good