We discuss some common issues of mathematics. If you ask, for example, II, II = How much? What will be the answer? + (4) or what - (4)? Not a simple matter. Because we know, (-2) X (-2) = + (4). But actually - -2 = - (4), + (4) is not. Why? Because if we look very well, we have a little complexity in the question. Here we are told to class 2, (-) the sign is placed outside the class of 2. So the square of 2 is 4 and before that the minus sign will be. If the question was (-2) 2 = how much? Then the answer would be + (4). Reason (-2) 2 = (-2) X (-2) = + (4). But here is the question - 2 = how much? The answer is, II, II = - (ii) ii = - (4)
Another point of math is the question to turn 0! = How much? What is the value of factorial 0? We can discuss a bit about the Factories here. The symbol with which the factorial of a number is meant to be! (Which is an amazing sign in Bengali). The factorial of any number is the continuous product of numbers from 1 to 1. Such as 5! = 5X4X3X2X1 = 120 That's 2! = 2x1 = 2, 1! = 1X1 = 1 Then 0! = How much? This is a difficult question. But we can find out the answers in simple rules of arithmetic. For example, 4! = (5! / 5) = (5x4x3x2x1 / 5) = (4x3x2x1) = 24 3! = (4! / 4) = (4x3x2x1) / 4 = (3x2x1) = 6 2! = (3! / 3) = (3x2x1) / 3 = 2 1! = (2!) / 2 = (2X1) / 2 = 1 Likewise, 0! = (1!) / 1 = 1 This way we can say 0! Its value is 1.
The puzzle of this week
from 3 to 99 is the sum of 3 multiples of 3, that is, 3 divided by 3, what is their sum?
Here are some simple formulas for mathematics. Online comment form or quayum @ gmail. com Send e-mail replies. For the right answer, see online Sunday.
The answer to the
puzzle of last week was like this: If two trains from Dhaka and Chittagong travel to the opposite city at the same time and if their speed is 130 and 120 kilometers per hour, then about an hour before the distance between them, Was there?
Answer: The
distance between them was 250 kilometers.
Almost everyone gave the correct answer. Thank you all.
How did I get the answer?
It is noteworthy that we just wanted to know how much distance between them was between an hour before the two trains crossed each other. Because the train will cross 130 and 120 kilometers respectively in one hour, so this is the distance between them. That is, the distance (130 + 120) = 250 kilometers