1st attempt खराब गया ? अब किस पर focus करे ? JEE Mains 2nd attempt?

Discussion OF Ex.-2 Q. 1 to 46 JEE Mains

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A test has 60 questions. For each correct answer 2 marks are awarded and each wrong answer 1 marks is deducted. A candidate attempted all the questions in the test and scored 90 marks. Find the number of questions he attempted correctly

Statement-1: The image focus (2^(nd) focus) and the object ( 1^(st) focus) for a biconvex lens are on the opposite side of the lens. Statement-2: The centre of curvature of a biconvex lens are on the opposite side of the lens.

In a school there are two prizes for excellence in Mathematics (1 st and 2 nd ) two in Chemistry (1 st and 2nd) and only one in Physics (1st). In how many ways can these prizes be awarded to 20 students?

Prove that a student can attempt one or more questions out of 8 questions in 2^(8)-1 ways.

Railway fares of 1st, 2nd and 3rd class between two stations were in the ratio of 8 6 : 3. The fares of 1st and 2nd class were subsequently reduced by 1/6a n d1/(12) respectively. If during a year the ratio 12 between the passengers of 1st, 2nd and 3rd classes was 9 :12 : 26 and the total amount collected by the sale of tickets was Rs, 1088, then find the collection from the passengers of 1st class. R s .260 b. R s .280 c. R s .300 d. R s .320

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The sum of three numbers is 315. If the ratio between 1st and 2nd is 2 : 3 and the ratio between 2nd and 3rd is 4 : 5, then find the 2nd number.