1 . If A + B + C = 180°, then find the value of cotAcot B + cotBcotC + cotC cotA.
    (A) –1 (B) 1
    (C) 10 (D)π
    A.  a
    B.  b
    C.  c
    D.  d
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    2 .
    A.  20°
    B.  40°
    C.  60°
    D.  80°
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    3 .
    A.  50°
    B.  60°
    C.  70°
    D.  45°
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    4 .
    A.  90°
    B.  105°
    C.  135°
    D.  180°
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    5 .
    A.  1
    B.  -1
    C.  0
    D.  2
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    6 . A father is 39 times older than his son. 18 year later, he will be only thrice as old as his son. Father's present age is –
    A.  25 years
    B.  39 years
    C.  40 years
    D.  45 years
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    7 .
    A.  a
    B.  b
    C.  c
    D.  d
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    8 .
    A.  42
    B.  53
    C.  60
    D.  40
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    9 . If x* y= $(x+ 3)^2$ 2 (y–1), then find the value of 5 * 4.
    A.  192
    B.  182
    C.  180
    D.  172
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    10 . If A:B= $1\over2$ : $3\over8$ B:C = $1\over3$ : $5\over9$ and C:D = $5\over6$ : $3\over4$, then find the ratio of A : B : C : D.
    A.  6 : 9 : 8 : 10
    B.  6 : 8 : 9 : 10
    C.  8 : 6 : 10 : 9
    D.  9 : 6 : 8 : 10
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