Find the value of  42-42-42......∞ from Class 12

Subject

Mathematics

Class

TET Class 12

Pre Boards

Practice to excel and get familiar with the paper pattern and the type of questions. Check you answers with answer keys provided.

Sample Papers

Download the PDF Sample Papers Free for off line practice and view the Solutions online.
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 Multiple Choice QuestionsMultiple Choice Questions

1.

The nature of Mathematics is

  • logical

  • ornamental

  • difficult

  • not for common people


2.

If 1225 = 35, then find the value of 12.25 + 0.1225 + 0.001225.

  • 38.85

  • 3.885

  • 388.5

  • 0.3885


3.

A's income is 150% more than that of B, than how much per cent is B's income less than that of A?

  • 50%

  • 60%

  • 12.5%

  • 25%


4.

Find the sum of 0.01 0.1+0.10.01

  • 10.11

  • 10.10

  • 1.10

  • 11.10


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5.

A method of teaching in which students work like a researcher and solve the problems.

  • Inductive Method

  • Deductive Method

  • Project Method

  • Heuristic Method


6.

The remainder obtained when 231 is divided by 5

  • 1

  • 2

  • 3

  • 4


7.

Appropriate method for establishment of the formulae in Mathematics is

  • induction

  • planning

  • synthesis

  • None of these


8.

If means x, x means +, + means + and + means -, then find the value of 14 - 10 x 4 + 16 + 8

  • 6

  • 142

  • 134

  • 2


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9.

Simplify 3÷8-5÷4-2÷2+813

  • 1317

  • 1713

  • 6813

  • 1368


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10.

Find the value of  42-42-42......

  • 3

  • 6

  • 7

  • 14


B.

6

Let x = 42-42-42........

Squaring on both sides 

x2 = 42 - x 
x2+x-42=0
x2+7x-6x-42=0
x(x+7)-6(x+7)=0
(x-6)(x+7)=0
x=6 and x=-7
Hence x=6 since x =-7 (not possible )


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