Question
The number of ways in which a mixed double game can be arranged amongst nine married couples so that no husband and his wife play in the same game, is equal to:
The correct answer is:
First of all two men can be selected in 9C2ways. Thereafter 2 women can selected in 7C2 ways (as wives of selected men are not be selected). And finally they can be paired up in 2C1 ways.
Thus total ways =
Related Questions to study
There are ‘n’ numbered seats around a round table. Total number of ways in which 
persons can sit around the round table, is equal to:
There are ‘n’ numbered seats around a round table. Total number of ways in which persons can sit around the round table, is equal to:
(A) An exothermic process, non-spontaneous at high temperature, may become spontaneous at low tempemture.
(R) With decrease in temperature, randomness (entropy) decrease.
(A) An exothermic process, non-spontaneous at high temperature, may become spontaneous at low tempemture.
(R) With decrease in temperature, randomness (entropy) decrease.
Nature of sound wave is
Nature of sound wave is
(A) Pressure, volume and temperature are all extensive properties
(R) Extensive properttes depend upon the amount and nature of the substance
(A) Pressure, volume and temperature are all extensive properties
(R) Extensive properttes depend upon the amount and nature of the substance
(A) Heat of neutralization of perchloric acid, HCI04, with NaOH is same as that of HCl with NaOH
(R) Both HCI and HCI04 are strong acids
(A) Heat of neutralization of perchloric acid, HCI04, with NaOH is same as that of HCl with NaOH
(R) Both HCI and HCI04 are strong acids
(A) Enthalpy of graphite is lower than that of diamond
(R) Entropy of graphite is lower than that of diamond
(A) Enthalpy of graphite is lower than that of diamond
(R) Entropy of graphite is lower than that of diamond
(A) Efficiency of a reversible engine is 100% (maximum) when the temperature of sink is - 273°C.
(R) Efficiency of engine, 
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(R) Efficiency of engine,
The heat liberated when 1.89 g of benzoic acid is burnt in a bomb calorimeter at 25°C increases the temperature of 18.94 kg of water by 0.632°CIf the specific 'heat of water at25°e is 0.998 calg-1deg-I ,the value of heat of combustion of benzoic acid is:
The heat liberated when 1.89 g of benzoic acid is burnt in a bomb calorimeter at 25°C increases the temperature of 18.94 kg of water by 0.632°CIf the specific 'heat of water at25°e is 0.998 calg-1deg-I ,the value of heat of combustion of benzoic acid is:
The enthalpy of solution of BaCl2 (s) and BaC12 2HzCXs) are -20.6 and 8.8 kJ mol-I, respectively. The enthalpy change for the reaction is:
The enthalpy of solution of BaCl2 (s) and BaC12 2HzCXs) are -20.6 and 8.8 kJ mol-I, respectively. The enthalpy change for the reaction is:
Which one of the following statements is false?
State functions depend on a substance's state, such as its amount, type, temperature, or pressure. In actuality, state functions are independent of how the state was created or reached.
State function refers to a set of characteristics that depend only on the initial and final states and not intermediate steps in a reaction or a path. For example, Gibb's free energy.
Heat and work are not functions of the state. Work cannot be the state function because it is proportional to an object's distance moved, determined by the path taken from the initial to the final state. So heat isn't a state function if work isn't.
Which one of the following statements is false?
State functions depend on a substance's state, such as its amount, type, temperature, or pressure. In actuality, state functions are independent of how the state was created or reached.
State function refers to a set of characteristics that depend only on the initial and final states and not intermediate steps in a reaction or a path. For example, Gibb's free energy.
Heat and work are not functions of the state. Work cannot be the state function because it is proportional to an object's distance moved, determined by the path taken from the initial to the final state. So heat isn't a state function if work isn't.
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