Search found 3 matches
- Thu Mar 22, 2018 10:38 am
- Forum: National Math Olympiad (BdMO)
- Topic: BDMO 2018 junior 10
- Replies: 12
- Views: 8120
Re: BDMO 2018 junior 10
I think u need a revision.
- Tue Dec 26, 2017 3:27 pm
- Forum: Number Theory
- Topic: Prime numbers
- Replies: 4
- Views: 6899
Re: Prime numbers
a prime is odd (ignore 2!!) .......odd-even=odd..... $odd^2$ =odd.....odd+1=even...but it cannot be prime(ignore $2$)...... so remaining is $2$...setting $n=2$ we get, $(n-6)^2 + 1$ =$17$.... setting $n=5 or 7$ we get the term as 2...it is a prime so....solution....these type of primes are 2,5 ,7
- Wed Nov 22, 2017 2:25 pm
- Forum: Divisional Math Olympiad
- Topic: BdMO 2017 : Dhaka
- Replies: 3
- Views: 3706
Re: BdMO 2017 : Dhaka
it is a power of 10......i mean 2*5...........using them in various combination......u will get the answer.........try out urself