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- Question
Which of the following statements is not true?
Options- A. The difference of two prime numbers, both greater than 2, is divisible by 2
- B. For two different integers m, n and a prime number p, if p divides the product m × n, then p divides either m or n.
- C. If a number is of the form 6n ?1 (n being a natural number), then its is a prime number.
- D. There is only one set of three prime numbers such that there is a gap of 2 between two adjacent prime numbers.
- Correct Answer
- There is only one set of three prime numbers such that there is a gap of 2 between two adjacent prime numbers.
- 1. Consider the multiplication 999 × abc = def132 in decimal notation, where a, b, c, d, e and f are digits. What are the values of a, b, c, d, e and f respectively?
Options- A. 6, 6, 8, 6, 8, 7
- B. 8, 6, 8, 6, 7, 8
- C. 6, 8, 8, 7, 8, 6
- D. 8, 6, 8, 8, 6, 7 Discuss
- 2. How many pairs (A, B) are possible in the number 479865AB if the number is divisible by 9 and it is given that the last digit of the number is odd?
Options- A. 5
- B. 6
- C. 9
- D. 11 Discuss
- 3. Which one of the following is an irrational number?
Options- A. ?59059
- B. 231/593
- C. 0.454545....
- D. 0.121122111222 Discuss
- 4. Consider the following statements in respect of two integers p and q (both > 1) which are relatively prime: 1) Both p and q may be prime numbers. 2) Both p and q may be composite numbers 3) one of p and q may be prime and the other composite. Which of the above statements are correct?
Options- A. 1 and 2 only
- B. 2 and 3 only
- C. 1 and 3 only
- D. 1, 2 and 3 Discuss
- 5. What is the unit place digit in the expansion of 773 ?
Options- A. 1
- B. 3
- C. 7
- D. 9 Discuss
- 6. Sum of twice a fraction and 5 times its reciprocal is 7. What is the fraction?
Options- A. 2/5
- B. 5/4
- C. 5/2
- D. 4/5 Discuss
- 7. The 3rd and 6th term of an arithmetic progression are 19 and 37 respectively. What is the 13th term?
Options- A. 79
- B. 43
- C. 45
- D. 49 Discuss
- 8. Convert binary 10110 to decimal.
Options- A. 22
- B. 20
- C. 18
- D. 16 Discuss
- 9. What is the reflection of the point (6, -3) in the line y = 2?
Options- A. (-2 , -3)
- B. (6 , 7)
- C. (-6 , 7)
- D. (-2 , 3) Discuss
- 10. What least number must be subtracted from 518, so that the sum is completely divisible by 13?
Options- A. 11
- B. 10
- C. 9
- D. 12 Discuss
Numbers problems
Search Results
Correct Answer: 8, 6, 8, 8, 6, 7
Correct Answer: 5
Correct Answer: 0.121122111222
Correct Answer: 1, 2 and 3
Correct Answer: 7
Correct Answer: 5/2
Correct Answer: 79
Correct Answer: 22
Correct Answer: (6 , 7)
Correct Answer: 11
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