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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