Quant Question Of The Day: 42
[latexpage]
Numbers
If p is a prime such that (p – 1)/4 and (p + 1)/2 are primes, then how many values of p are possible.
i) 0
ii) 1
iii) 2
iv) 3
v) More than 3
Recent Forum Posts/Questions/Answers
Recent Blog Posts
Recent Blog Comments
- LouisHayes on Quant Question Of The Day: 275
- pankaj saket on GK Question of the day: 22
- sajal on Puzzle of The Day
- sajal on Puzzle of The Day
- Lalit Bansal on Quant Question Of The Day: 275
- Rajendra Kumar on Countdown to CAT 2020|DAY 87|LRDI
- Shruti Tiwari on GK Question of the day: 21
- Deepika on GK Question of the day: 21
- Deepika on Quant Question Of The Day: 275
- Anubhav Swaroop on Quant Question Of The Day: 269
Other websites
© 2007-2020 by TathaGat.
5
Hello Arushi
5 values or p = 5 ?
More than 3
Hello Priyanka,
What was your approach?
0
What approach did you use, Samyak?
0
Hello Parth
What was your approach?
1
Correct! What approach did you use?
iii) 2
Hello Manish,
Which two values?
0
Sir, I used the fact that all the prime numbers are of the form 6n+1 or 6n-1. I replaced the value of p with the above two values and I found no solution.
1
I used hit and trial method and only 13 is that value of p that gives the other two primes .
is there any other solution ?