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dracarys007
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25 Jul 2020, 09:10
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Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
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What is the sum of the prime numbers that are greater than 80 and less than 100?
A. 269
B. 270
C. 271
D. 272
E. 273
A. 269
B. 270
C. 271
D. 272
E. 273
25 Jul 2020, 11:38
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dracarys007
What is the sum of the prime numbers that are greater than 80 and less than 100?
A. 269
B. 270
C. 271
D. 272
E. 273
A. 269
B. 270
C. 271
D. 272
E. 273
We can list out the candidates, 81, 83, 87, 89, 91, 93, 97, 99. Among them, 81, 87, 93, 99 are divisible by 3. Notably 91 = 7 * 13 is not a prime number.
So we have 83, 89, 97 only as primes. The sum of the unit digits is 3 + 9 + 7 ends in a 9 so we choose A.
Ans: A
28 Jul 2020, 10:14
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dracarys007
What is the sum of the prime numbers that are greater than 80 and less than 100?
A. 269
B. 270
C. 271
D. 272
E. 273
A. 269
B. 270
C. 271
D. 272
E. 273
Hello guys!
This question will take less than 20 seconds if you know the prime numbers well.
We have only 3 prime numbers between 80 and 100, i.e. 83, 89 and 97.
Add their units digits 3+9+7= 9 is the units digit here.
We find this in Option A that is 269.
Official Answer:- Option A
Thank you!
Regards,
Raunak Damle
