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Find out how many different ways to choose items. For an in-depth explanation of the formulas please visit Combinations and Permutations.
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1 Ιουν 2016 · You’re 100% correct. There are 10 possible numbers for the first digit, and then you can’t use that number again, so 9 for the second, and using the same logic, 8 for the third and 7 for the fourth. That means there’s 10 × 9 × 8 × 7 = 5040 10 × 9 × 8 × 7 = 5040 combinations.
The ratio of radius of two different orbits in a H-atom is 4: 9. Then, the ratio of the frequency of revolution of electron in these orbits is: (A) 2:3 (B) 27:8 (C) 3:2 (DI 8:27. Solution.
Area of a general quadrilateral given four sides and two diagonals. Area of a quadrilateral given four sides and the fact that it is a cyclic quadrilateral. This is a particular case of Bretschneider's formula (we know that sum of two opposite angles are 180), known as Brahmagupta's formula.
Answer by tjnw79 (57) ( Show Source ): You can put this solution on YOUR website! really says -2*-2=4 You are squaring everything that is in the parethesis. and so says -2*2=-4.
Factor x^2-9. x2 − 9 x 2 - 9. Rewrite 9 9 as 32 3 2. x2 − 32 x 2 - 3 2. Since both terms are perfect squares, factor using the difference of squares formula, a2 −b2 = (a+b)(a−b) a 2 - b 2 = ( a + b) ( a - b) where a = x a = x and b = 3 b = 3.
