allery20 से छोटी कितनी अभाज्य संख्याएं हैं?
A8
B6
C9
D7
Answer & Solution
Correct answer: A. 8
20 से छोटी अभाज्य संख्याएं: 2, 3, 5, 7, 11, 13, 17, 19 हैं। कुल संख्या 8 है।
Keep practising Number System
Browse all Number System questions for RRB NTPC, or explore more Quantitative Aptitude topics.
Related questions
For rational numbers a/b and c/d with strictly positive denominators, a/b < c/d holds precThe fundamental theorem of arithmetic guarantees that prime factorization of an integer isIf the 7-digit number 5432y71 is divisible by 9, what is the single-digit value of y?Under the ancient rules formulated by Brahmagupta, subtracting zero from a fortune resultsWhich celebrated 6-digit recurring sequence forms the cyclic repeating block in decimal 1/In number theory, what specific technical name is given to the property of being a prime nWhen does long division of a rational fraction terminate?How many rational numbers lie between any two rational points?