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How many two digit numbers have their squares as 1 more than a multiple of 24?

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Important Questions on Number Systems

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There are 80 questions in a test. Each correct answer fetches 1 mark, each wrong answer and unanswered question attract penalty of 14 mark and 18 mark respectively each. Frodo scored 23 marks in the test. What is the minimum possible number of the question wrongly answered by him?
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1777 has exactly 5 digits when converted to base 'x' from the decimal system. What is the minimum possible value of x?
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What will be the sum of all natural numbers between 101 and  1000 which on division by 2, 4, 6, 8, 10 leave remainders 1, 3, 5, 7, 9 respectively?
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Unit digit of which of the following is the same as the units digits of a17+b17For any positive integer value of a,b?
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How many 4 Digit numbers are there in the decimal system, which have exactly 4 Digits when expressed in Base 6, Base 7, Base 8?
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What is the difference between the highest and the least four digit natural numbers that have exactly four digits when expressed in Base 6 and Base 7.
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If n is a natural number, then what is the sum of all the possible distinct remainders when 9n+6n+4n+11n is divided by 10?
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If x, y, z and w are natural numbers, then what is the sum of all the possible remainders when 9x+6y+4z+11z is divided by 10?