বুঝাও (Teach Me)

What Is derivative? (Part - 1) Derivative is a simple thing. It’s just the difference of a variable. But how? Think of time, let a person started a journey towards bus stand at time t1 = 3 and reached at t2 = 7. In this case the derivative dt = t2-t1 = 7-3 = 4. Easy! But in real life things are not that easy. Because we have do derive the difference of a variable with respect to another variable unlike our time example where there was only one variable. For example we can see the equation y = x. Here we have to find the difference in y with respect to the change in variable x. In other word we have to find the derivative of y with respect to x which is dy/dx. Fortunately for us this is very easy. Pretty easy right. But we are going to prove it so that we can use the same theory to prove more complex derivatives. So we are going to plot this function into graph. Let’s find some value of x and values of y for the respective value of x below. ...

RAID -> Redundant Array of Independent Disks -> It is a method in which multiple hard disks are placed in parallel and are controlled as if they were one disk unit -> It has 6 Levels RAID0 to RAID6 RAID Levels -> RAID0 : Writes block of fixed size in multiple disks. -> RAID1 : Records same data on two disk for safety. -> RAID2 : Correct error -> RAID3 and RAID4 : Detect error -> RAID5 : each data block is assigned a parity value. Upon failure of a single drive, subsequent reads can be calculated from the distributed parity such that no data is lost. -> RAID6 : extends RAID 5 by adding another parity block. the data is recoverable even when two disks fail.

Reverse Polish Notation -> Take e = a – b ÷ ( c + d ) -> Lets convert it into Reverse Polish Notation -> ( c + d ) will be cd+ and Let p = cd+ -> e = a – b ÷ p -> b ÷ p will be bp÷ and Let q = bp÷ -> e = a – q -> a – q will be aq- and Let r = aq- -> e = r -> e = r will be er= and let s = er= -> s -> Lets put the values back -> s will be er= -> er= will be eaq-= -> eaq-= will be eabp÷-= -> eabp÷-= will be eabcd+÷-= -> eabcd+÷-= Polish Notation -> Take e = a – b ÷ ( c + d ) -> Lets convert it into Polish Notation -> ( c + d ) will be +cd and Let p = +cd -> e = a – b ÷ p -> b ÷ p will be ÷ bp and Let q = ÷ bp -> e = a – q -> a – q will be -aq and Let r = -aq -> e = r -> e = r will be =er and let s = =er -> s  -> Lets put the values back -> s will be =er -> =er will be =e-aq -> =e-aq will be =e-a÷bp -> =e-a÷bp will be =e-a÷b...

Number Types Decimal Hex Octal Binary Possible Conversations Decimal <-> Binary Decimal <-> Octal Decimal <-> Hex Binary <-> Octal Binary <-> Hex Octal <-> Hex Decimal -> Binary -> Take decimal 49 -> 64 is big so -> 32 X (1/0) + 16 X (1/0) + 8 X (1/0) + 4 X (1/0) + 2 X (1/0) + 1 X (1/0) -> 32 X 1 + 16 X 1 + 8 X 0 + 4 X 0 + 2 X 0 + 1 X 1 -> 110001 Binary -> Decimal -> Take binary 110001 -> 32 X 1 + 16 X 1 + 8 X 0 + 4 X 0 + 2 X 0 + 1 X 1 -> 49 Decimal -> Octal -> Take decimal 49 -> 64 is big so -> 32 X (1/0) + 16 X (1/0) + 8 X (1/0) + 4 X (1/0) + 2 X (1/0) + 1 X (1/0) -> 32 X 1 + 16 X 1 + 8 X 0 + 4 X 0 + 2 X 0 + 1 X 1 -> 110001 -> divide into 3 digits -> 110 and  001 -> 6 and 1 -> 61 Octal -> Decimal -> Take octal 61 -> 6 and 1 -> convert into 3 digit...