Board Paper of Class 12Commerce 2012 Maths (SET 3)  Solutions
General Instructions:
i. All questions are compulsory.
ii. The question paper consists of 29 questions divided into three sections A, B and C. Section A comprises of 10 questions of one mark each, Section B comprises of 12 questions of four marks each, and Section C comprises of 7 questions of six marks each.
iii. All questions in section A are to be answered in one word, one sentence or as per the exact requirements of the question.
iv. There is no overall choice. However, internal choice has been provided in 4 questions of four marks each and 2 questions of six marks each. You have to attempt only one of the alternatives in all such questions.
v. Use of calculators is not permitted.
i. All questions are compulsory.
ii. The question paper consists of 29 questions divided into three sections A, B and C. Section A comprises of 10 questions of one mark each, Section B comprises of 12 questions of four marks each, and Section C comprises of 7 questions of six marks each.
iii. All questions in section A are to be answered in one word, one sentence or as per the exact requirements of the question.
iv. There is no overall choice. However, internal choice has been provided in 4 questions of four marks each and 2 questions of six marks each. You have to attempt only one of the alternatives in all such questions.
v. Use of calculators is not permitted.
 Question 1
Let * be a ‘binary’ operation on N given by a * b = LCM (a, b) for all a, b ∈ N. Find 5 * 7.
VIEW SOLUTION
 Question 2
Write the principal value of
VIEW SOLUTION
 Question 3
 Question 4
 Question 5
 Question 6
 Question 7
Find ‘λ’when the projection of
VIEW SOLUTION
 Question 8
If a line has direction ratios 2, − 1, − 2, then what are its direction cosines?
VIEW SOLUTION
 Question 9
Find the sum of the following vectors:
VIEW SOLUTION
 Question 10
If , write the cofactor of the element a_{22}.
VIEW SOLUTION
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