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amit
: Posted in
Topic :-
Math
- Sub Topic :-
Vector and 3D
Addition of vectors
four diagonals of a parallelopiped and the joins of the mid points of opposite edges are concurrent at acommon point of bisection.
12/14/2011
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ritu
: Replied
Taking as origin, let the position vectors of A, B and C be a, b and c respectively so that those of I), E and F are a+b, b+c, c+a respectively and that of G is a+b+c. If M! be the mid. point of diagonal OG, then M t is a+b+c If Af 2 be the mid. point of diagonal AE and M 2 is a+b+c { e M Similarly mid. point of other diagonals DC and BF is also the point whose position vector is . 4 Again mid. point L of BD is J (b+a+b)=s* ~ and mid. point M of CF is | /. mid. point G of LM is i
12/14/2011
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amit
: Posted in
Topic :-
Math
- Sub Topic :-
Probability and Statistics
permutation and combination
how many three digits can be formed from 0 to 9.
12/14/2011
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ritu
: Replied
using p and c 9*10*10 =900
12/14/2011
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ritu
: Posted in
Topic :-
Math
- Sub Topic :-
Algebra
probability
in shuffling a pack of 52 cards,4 are accidentally dropped.find the probability that the missing card should be 1 from each suit.
12/9/2011
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amit
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number of ways to choose 4 cards such that they the all 1s = 1 number of ways to choose any 4 cards out of 52 = 52C4 therefore probability = 1/45C4
12/10/2011
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