There are four prime numbers written in ascending order of magnitude. The product of the first three is 7429 and last three is 12673. Find the first number.
Explanation:
7429 = 17 × 19 × 23
17, 19 and 23 are consecutive primes.
Also, 12673 = 19 × 23 × 29
Hence, first number = 17
Hence, option (b).
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