Hi. guys:
Try this question.
There are five letters, two A's, B, C & D. How many arrangements if two A's cannot be next to each other and B cannot be first.
Good luck!
Qusetion:
Hi, friends! Try this question.
Find x and y is (x+iy)^2=3-4i where x and y are real number?
The best solution is posted on "The solution of complex number". I wish it will save u a lots of time and get right answer without any mistakes.
Enjoy!
A biased coin, the probability of the head for a toss is p, where p not equal to 0.5 and 0<p<1, is tossed ten times.
Q1) Find the probability for exact two heads
Q2)Find the probability for exactly consecutive two heads only
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