The maximum value of the sum is = 18 + 2*(17+16+....+8)=18+9*25=225+18=243.
So answer is 243.
Search found 8 matches
- Tue Jan 24, 2023 11:14 pm
- Forum: National Math Olympiad (BdMO)
- Topic: BdMO National 2021 Junior Problem 5
- Replies: 1
- Views: 44942
- Sun Jan 22, 2023 8:31 pm
- Forum: National Math Olympiad (BdMO)
- Topic: BdMO National 2021 Primary Category Problem 7
- Replies: 2
- Views: 46230
Re: BdMO National 2021 Primary Category Problem 7
By Euclidean Division algorith,
gcd = 8 (5n+3)-5(8n+1) = 19
Answer is 19.
gcd = 8 (5n+3)-5(8n+1) = 19
Answer is 19.
- Sun Jan 22, 2023 8:18 pm
- Forum: National Math Olympiad (BdMO)
- Topic: BdMO National 2021 Primary Problem 6
- Replies: 3
- Views: 47440
Re: BdMO National 2021 Primary Problem 6
For n the answer is n.
The answer is 8.
The answer is 8.
- Sun Jan 22, 2023 5:56 pm
- Forum: National Math Olympiad (BdMO)
- Topic: BdMO National Primary 2020 P12
- Replies: 1
- Views: 43679
Re: BdMO National Primary 2020 P12
Ans: 12*59 - 13 = 695
- Sun Jan 22, 2023 5:31 pm
- Forum: National Math Olympiad (BdMO)
- Topic: BdMO National Primary 2020 P9
- Replies: 1
- Views: 44372
Re: BdMO National Primary 2020 P9
We can think it by odd and even. if we change the number randomly only the first and last number will change their place. But the middle number will not change. So from 1 to 9 there are 5 odd and 4 even number. Then we permute odd and even number is 5! and 4! ways, as the choice is independent. So o...
- Sat Jan 21, 2023 1:32 pm
- Forum: Primary Level
- Topic: FIND THE NEXT THREE TERM
- Replies: 5
- Views: 64206
Re: FIND THE NEXT THREE TERM
49, 94, 181
- Sat Jan 21, 2023 1:09 pm
- Forum: Primary Level
- Topic: Easy sum
- Replies: 3
- Views: 52583
Re: Easy sum
the sum of the numbers is: 2^3 + 5^3 = 133
- Sat Jan 21, 2023 12:59 pm
- Forum: Secondary Level
- Topic: BdMO 2020 Secondary - Regional - P15
- Replies: 3
- Views: 59130
Re: BdMO 2020 Secondary - Regional - P15
I also tried.
My total ans is = 4*55*55 = 12100
My total ans is = 4*55*55 = 12100