Waste less time on Facebook — follow Brilliant.


P. Q .R =19(P+R)

HERE P, Q, R are distinct prime . find P, Q, R ????

NOTE - here P .Q .R means P multiplied by Q and R. means P. Q. R is not a 3 digit no.

Note by Jai Gupta
2 years, 11 months ago

No vote yet
1 vote


Sort by:

Top Newest

ya you are correct but if they are not distinct primes then this is possible values are 2, 2 19 Jai Gupta · 2 years, 11 months ago

Log in to reply

If PQR = 19(P+R) then one of P, Q and R is 19. If Q=19 then P+R=PR which isn't possible for distinct primes. If P=19 (chosen without loss of generality), 19+R = QR. R must be odd, as 19+2 =21 which is not prime, so 19+R is even. As 19+R = QR, QR is even, Q is even, Q is 2. But the only solution to 19+R=2R is R=19 which, again, leads to P, Q and R not being distinct.

So... no. It isn't possible. James Moors · 2 years, 11 months ago

Log in to reply


Problem Loading...

Note Loading...

Set Loading...