Which of the following type of class allows only one object of it to be created? ?->(Show Answer!)

1. Which of the following type of class allows only one object of it to be created?

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MCQ-> Answer questions on the basis of information given in the following case. Bright Engineering College (BEC) has listed 20 elective courses for the next term and students have to choose any 7 of them. Simran, a student of BEC, notices that there are three categories of electives: Job - oriented (J), Quantitative - oriented (Q) and Grade - oriented (G). Among these 20 electives, some electives are both Job and Grade - oriented but are not Quantitative - oriented (JG type). QJ type electives are both job and Quantitative - oriented but are not Grade - oriented and QG type electives are both Quantitative and Grade - oriented but are not Job - oriented. Simran also notes that the total number of QJ type electives is 2 less than QG type electives. Similarly, the total number of QG type electives is 2 less than JG type and there is only 1 common elective (JQG) across three categories. Furthermore, the number of only Quantitative - oriented electives is same as only Job - oriented electives, but less than the number of only Grade - oriented electives. Each elective has at least one registration and there is at least one elective in each category, or combinations of categories.On her way back Simran met her friend Raj and shared the above information. Raj is preparing for XAT and is only interested in Grade - oriented (G) electives. He wanted to know the number of G - type electives being offered. Simran replied, “You have all the information. Calculate the number of G - type electives yourself. It would help your XAT preparation”. Raj calculates correctly and says that there can be _______ possible answers. Which of the following options would b est fit the blank above?
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MCQ-> Read the following information and answer the given question.Seven people, namely O, P, Q, R, S, T and U have to attend a practical but not necessarily in the same order, on seven different months (of the same year) namely February, March, April, June, August, September and November. Each of them also likes a different subject namely Chemistry, Biology, Psychology, Hindi, English, Geography and Account but not necessarily in the same order. The one who likes Hindi will attend a practical in a month which has 31 days. Only two people will attend a practical between the one who likes Hindi and T. Only three people will attend a practical between T and Q. Only one person will attend a practical between Q and the one who likes Accounts. The one who likes Chemistry will attend a practical in one of the months before the one who likes Accounts. The one who likes Chemistry will attend a practical in the month which has less than 30 days. Only two people will attend a practical between the one who likes Chemistry and S. Only one person will attend a practical between S and the one who likes Psychology. The one who likes Psychology will attend a practical on one of the months after S. Only two people will attend a practical between the one who likes Psychology and P. The one who likes Geography will attend a practical immediately before P. Only three people will attend a practical between P and the one who likes English. Only ,one people will attend a practical between 0 and R. 0 will attend a practical in a month which has 31 days.Who amongst the following likes Biology ?
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