Which is not formed by multiplying two consecutive primes?
Given
Options: 143, 323, 221, 391
Formula Used
Prime factorization of numbers.
Solution
Checking each option:
Option A: 143 = (11 and 13 are consecutive primes)
Option B: 323 =(17 and 19 are consecutive primes)
Option C: 221 = (13 and 17 are consecutive primes)
Option D: 391 = (17 and 23 are NOT consecutive primes; 19 is between them)
Final Answer
So the correct answer is (d)
English
25 Questions
100 Marks
20 Mins English English50 Questions200 Marks30 Mins English English150 Questions600 Marks135 Mins EnglishWhich is not formed by multiplying two consecutive primes?
Four prime numbers are arranged in ascending order. The product of first three numbers is 255 and the product of last three numbers is 1955. The largest prime number is
For any three distinct prime numbers, all greater than 13, which of the following is NOT true?
The number of 2-digit prime numbers in which digits are also prime is:
The product of the smallest prime number and the smallest composite number is …………..
Which of the following is a prime factor of 54?
Which of the options below gives a pair of co-prime numbers?
Three numbers which are co-prime to each other are such that the product of the first two numbers is 143 and that of the last two numbers is 195. The sum of the three numbers is________
Which of the numbers given below is a prime number?
Suggested Test Series
Suggested Test Series
