Maths-

General

Easy

Question

# Assertion: There are three doors to a room The number of ways in which a student can enter the room and leave it by a different door is 6.

Reason: If an operation can be performed in ways and another operation can be perfO rmed in ways thenthe two operations in succession can be performed in mn ways.

- A is true, R is true and R is the correct explanation for A
- A is true, R is false and R is the not the correct explanation for A
- A is true, R is false
- A is false, R is true.

## The correct answer is: A is true, R is true and R is the correct explanation for A

### Related Questions to study

maths-

### Assertion(A): The number of quadratic expressions with the coefficients drawn from the set {0,1,2,3} is only 48 but not 64.

Reason(R): The coefficient inthe quadratic expression can not be ’

### Assertion(A): The number of quadratic expressions with the coefficients drawn from the set {0,1,2,3} is only 48 but not 64.

Reason(R): The coefficient inthe quadratic expression can not be ’

maths-General

maths-

### Assertion (A) : The number of ways of arranging 6 boys and 5 girls alternately at circular table is Reason (R) : To arrange boys and girls alternately at a circular table, they should be equal in number.

### Assertion (A) : The number of ways of arranging 6 boys and 5 girls alternately at circular table is Reason (R) : To arrange boys and girls alternately at a circular table, they should be equal in number.

maths-General

chemistry-

### GivenenthalpyofformationofCO2(g)andCaO(s) are–94.0KJand–152KJrespectivelyandthe enthalpyofthereaction-CaCO3(s) →CaO(s)+CO2(g) is42KJ.The enthalpyofformationofCaCO3(s)

### GivenenthalpyofformationofCO2(g)andCaO(s) are–94.0KJand–152KJrespectivelyandthe enthalpyofthereaction-CaCO3(s) →CaO(s)+CO2(g) is42KJ.The enthalpyofformationofCaCO3(s)

chemistry-General

chemistry-

### Change in entropy is negative for–

### Change in entropy is negative for–

chemistry-General

chemistry-

### The enthalpychange(DH) forthereaction,N2(g) +3H2(g) 3/4 →2NH3(g)is–92.38KJat 298K.TheinternalenergychangeDUat298Kis-

### The enthalpychange(DH) forthereaction,N2(g) +3H2(g) 3/4 →2NH3(g)is–92.38KJat 298K.TheinternalenergychangeDUat298Kis-

chemistry-General

chemistry-

### For a phase change H_{2}O(l) H_{2}O(s)M

### For a phase change H_{2}O(l) H_{2}O(s)M

chemistry-General

chemistry-

### The absolute enthalpy of neutral is ation of the reaction: MgO(s)+2HCl(aq)3/4→MgCl2(aq)+H2O(l) will be-

### The absolute enthalpy of neutral is ation of the reaction: MgO(s)+2HCl(aq)3/4→MgCl2(aq)+H2O(l) will be-

chemistry-General

chemistry-

### For which one of the following equations is D H reaction equal to DH° for the product-

### For which one of the following equations is D H reaction equal to DH° for the product-

chemistry-General

Maths-

### When a die is rolled twice, if the event of getting an even number is denoted by a success and the number of successes as a random variable, then distribution and mean of the variate are

### When a die is rolled twice, if the event of getting an even number is denoted by a success and the number of successes as a random variable, then distribution and mean of the variate are

Maths-General

chemistry-

### Enthalpy of CH4+ O2→CH3OH is negative. If enthalpy of combustion of CH4 and CH3OH are x and y respectively. Then which relation is correct-

### Enthalpy of CH4+ O2→CH3OH is negative. If enthalpy of combustion of CH4 and CH3OH are x and y respectively. Then which relation is correct-

chemistry-General

chemistry-

### Change in enthalpy for reaction 2H2O2(l) → 2H2O(l)+O2(g) If heat of formation of H2O2 (l) and H2O (l)are– 188&–286KJ/mol respectively

### Change in enthalpy for reaction 2H2O2(l) → 2H2O(l)+O2(g) If heat of formation of H2O2 (l) and H2O (l)are– 188&–286KJ/mol respectively

chemistry-General

chemistry-

### For there action C2H5OH(l)+3O2(g)→2CO2(g)+3H2O(l) Which one istrue -

### For there action C2H5OH(l)+3O2(g)→2CO2(g)+3H2O(l) Which one istrue -

chemistry-General

chemistry-

### 2Zn+O2 3/2 →2ZnODG°=–616J 2Zn+S2→2ZnSDG°=–293J S2+2O2 3/4 →2SO2DG°=–408J DG°forthefollowingreactionis-2ZnS+3O2 3/4 →2ZnO+2SO

### 2Zn+O2 3/2 →2ZnODG°=–616J 2Zn+S2→2ZnSDG°=–293J S2+2O2 3/4 →2SO2DG°=–408J DG°forthefollowingreactionis-2ZnS+3O2 3/4 →2ZnO+2SO

chemistry-General

Maths-

### A random variable has the following distribution.

Then for the values, A = K, B = Mean, C = Variance, the ascending order is

### A random variable has the following distribution.

Then for the values, A = K, B = Mean, C = Variance, the ascending order is

Maths-General

chemistry-

### The heat of combustion of ethanolina bomb calorimeteris–670.48Kcalmol–1at25°C.Whatis DE at 25°C for the reaction?

### The heat of combustion of ethanolina bomb calorimeteris–670.48Kcalmol–1at25°C.Whatis DE at 25°C for the reaction?

chemistry-General