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
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