Section 7 : Mathematical Reasoning
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Consider
x = - 1 y = - 2 (x and y are negative integers)
- (x + y) = - (-1 - 2) = - (-3) = 3 i.e. positive
- (x - y) = - (-1 + 2) = -1
y - x = - 2 + 1 = - 1
x - (-y) = - 1 - 2 = - 3
x + y = - 1 - 2 = - 3
\ - (x + y) is positive
Ans : A
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Radius of the required circle = 
Perimeter of the required circle = 
= p
k
= 
Ans : B
-
30 = 2 ´ 3 ´
5
Sum = 2 + 3 + 5
= 10
Ans : E
4. Ð
ABC = 40 + 85
= 125
Ans : B

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