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A - 187

B - 811

C - 341

D - 437

asked Jun 4, 2017 in apptitute by Amrendra | 11 views



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Step 1. Find a whole number k such that k2 > n for each number.
142 > 187.
302 > 811.
192 > 341.
212 > 437.

Step 2. Get all prime numbers which are < k
14 - 2 , 3, 5, 7, 11, 13
30 - 2 , 3, 5, 7, 11, 13, 17, 19, 23, 29
19 - 2 , 3, 5, 7, 11, 13, 17
21 - 2 , 3, 5, 7, 11, 13, 17, 19

Step 3. Check divisiblity of each number
with prime numbers which are < k.
187 is divisible by 11.
811 is not divisible by any prime number.
341 is divisible by 11.
437 is divisible by 19.

Result: 811 is the prime number.
answered Jun 4, 2017 by Amrendra

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