संख्यात्मक अभिरुचि
MediumQ. No. which-number-is-divisible-by-7
कौन-सी संख्या 7 से विभाज्य है?
Last Updated:
A49
B50
C51
D52
Correct Answer: 49Your Answer: A
Explanation
49 = 7×7.
Important Notes
- 49 ko concept ke saath revise karein.
- यह सामग्री अभी उपलब्ध नहीं है। ke similar MCQs ko exam practice ke liye repeat karein.
- संख्यात्मक अभिरुचि ke liye ye point quick revision me useful hai.
यह सामग्री अभी उपलब्ध न...
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Answer
49
Exam Info
- Asked in: SSC, Railway, Banking and other competitive exams.
- Also asked in: RRB NTPC, CHSL, State PCS and online mock tests.
- Topic: यह सामग्री अभी उपलब्ध नहीं है।
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यह सामग्री अभी उपलब्ध नहीं है। FAQs
Common questions and clear answers for this topic.
What is Number System in mathematics and what types of numbers are important for exams?
Number System covers Natural Numbers (1,2,3), Whole Numbers (0,1,2,3), Integers, Rational Numbers (p/q form), Irrational Numbers (like pi and root 2), and Real Numbers. For competitive exams like SSC CGL and IBPS, focus on: divisibility rules, LCM and HCF, factors, prime numbers, and unit digit calculations.
What are the important divisibility rules in Number System?
Divisibility rules: Divisible by 2 - last digit even. By 3 - sum of digits divisible by 3. By 4 - last two digits divisible by 4. By 5 - last digit 0 or 5. By 6 - divisible by both 2 and 3. By 8 - last three digits divisible by 8. By 9 - sum of digits divisible by 9. By 11 - difference of alternating digit sums divisible by 11. Mastering these rules helps solve Number System questions faster in competitive exams.
What is LCM and HCF and how are they calculated?
LCM (Least Common Multiple) is the smallest number divisible by all given numbers. HCF (Highest Common Factor) is the largest number that divides all given numbers. Methods: For HCF - prime factorization or Euclidean algorithm. For LCM - prime factorization. Key relationship: LCM x HCF = Product of two numbers (only for two numbers). LCM and HCF questions appear in all major competitive exams.
How to find the unit digit of large powers?
Unit digits follow cyclicity patterns: For 2 - cycle is 2,4,8,6 (length 4). For 3 - cycle is 3,9,7,1 (length 4). For 4 - cycle is 4,6 (length 2). For 7 - cycle is 7,9,3,1 (length 4). For 8 - cycle is 8,4,2,6 (length 4). For 0,1,5,6 - unit digit is always 0,1,5,6 regardless of power. Divide the power by the cycle length and use the remainder to find the unit digit.
What are prime numbers and composite numbers up to 100?
Prime numbers up to 100 (25 total): 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97. All other numbers (except 1) are composite. 1 is neither prime nor composite. 2 is the only even prime. To check if a number N is prime, check divisibility only up to the square root of N.