Search found 53 matches

by Shifat
Mon Aug 29, 2011 3:27 am
Forum: Secondary: Solved
Topic: Dhaka Secondary 2011/9
Replies: 9
Views: 7687

Re: Dhaka Secondary 2011/9

then maybe x= 2y where 2y mod 3 not equals 0 should be applied, suppose, 2,4,8,10,14,16,20........???(i am too interested in the problem, thinking randomly and making a mess please accept the apology??)
by Shifat
Sun Aug 28, 2011 3:45 pm
Forum: Number Theory
Topic: Help me with some basic instructions please
Replies: 4
Views: 1915

Re: Help me with some basic instructions please

THANK U AGAIN FOR THE MODIFICATIONS ...............
by Shifat
Sun Aug 28, 2011 3:28 pm
Forum: Number Theory
Topic: Help me with some basic instructions please
Replies: 4
Views: 1915

Re: Help me with some basic instructions please

thank U very much, I am trying to go through internert for now, no idea about any books...the answers will help my cause for sure.
by Shifat
Sun Aug 28, 2011 1:15 am
Forum: Number Theory
Topic: Help me with some basic instructions please
Replies: 4
Views: 1915

Help me with some basic instructions please

Since I have less Idea (some case no idea) about some mathematical terms.I like to seek help from u guys. please help me with useful replies- ques no 1- we know in modular arithmatics if $ a\equiv b(mod c)$............(1) then $. a-b\equiv 0(mod c)$ but how can we identify $ a/b\equiv ? (mod c)$ (ob...
by Shifat
Sat Aug 27, 2011 7:13 pm
Forum: H. Secondary: Solved
Topic: Rangpur Higher Secondary 2011/6
Replies: 5
Views: 5199

Re: Rangpur Higher Secondary 2011/6

yes the length of an arc= angle(radian)* radius(9-10 higher math book droshtobbo)
by Shifat
Sat Aug 27, 2011 2:22 am
Forum: H. Secondary: Solved
Topic: Dhaka Higher Secondary 2010/1 (Secondary 2010/8)
Replies: 3
Views: 4782

Re: Dhaka Higher Secondary 2010/1 (Secondary 2010/8)

I have no idea about summations, Do not even know what does the symbols and variables mean there( I beg someone teach me what are they, physics give me a lot of trouble for this), but comin to the function, for any number n, if it is prime then $\phi (n)$ is 0, and if it is not prime then it will co...
by Shifat
Sat Aug 27, 2011 2:12 am
Forum: H. Secondary: Solved
Topic: Rangpur Higher Secondary 2011/8
Replies: 3
Views: 4309

Re: Rangpur Higher Secondary 2011/8

My answer is 480, please check it there are four ways, the flags can be flagged like this 1st pole 2nd pole a. 4 1 b. 3 2 c. 2 3 d. 1 4 case a- the total number of permutations is 4! 5C4= 120(since 4 out of 5 can be selected in 5C4 ways)(all of them in the first pole) case b- the total number of per...
by Shifat
Sat Aug 27, 2011 12:34 am
Forum: Secondary: Solved
Topic: Dhaka Secondary 2011/9
Replies: 9
Views: 7687

Re: Dhaka Secondary 2011/9

Since if the values of x=2y typed then $X^2$ and $2^x$ will give the same remainder divided by 3, so, x is obviously even, for the first even number y=1, so actually the question becomes like this (2+4+6+8+........................4020+4022)(mod 1000)=?? or $2011.2012 (mod 1000)$ $2011.2012$= $(2000+...
by Shifat
Sat Aug 27, 2011 12:11 am
Forum: Secondary: Solved
Topic: Dhaka Secondary 2011/8
Replies: 3
Views: 2961

Re: Dhaka Secondary 2011/8

The answer is 33, to my reckon, here is how I got it: Let the Number is $ABCCBA$ $BCCB$ is dividable by 4 which means the probable value of BC is 04 to 96= 24 ways and the value of A is 2,4,6,8 among the 24 values of BC, 24/3= 8 values are dividable by 6(also 00 is dividable by 6, but will count it ...