# .In ΔABC, if 2R+ r= r1, then the triangle isa

1.  isosceles

2.  equilatcral

3.  right angled

4.  none

4

right angled

Explanation :
No Explanation available for this question

# There are 4 doors to a lecturer room. The number of ways in which a student can enter the room and leave it by a different door is

1.  12

2.  10

3.  18

4.  20

4

12

Explanation :
No Explanation available for this question

# A student has 5 pants and 8 shirts. The number of ways in which a student can wear the dress in different combinations is

1.  8P5

2.  8C5

3.  8! X 5!

4.  40

4

40

Explanation :
No Explanation available for this question

# An automobile dealer provides motor cycles and scooters in three body patterns and 4 different colours. The number of choices open to a customer is

1.  4P3

2.  4C3

3.  4 x 3

4.  4 x 3 x 2

4

4 x 3 x 2

Explanation :
No Explanation available for this question

# A letter lock contains 5 rings each marked with four different letters. The number of all possible unsuccessful attempts to open the lock is

1.  625

2.  1024

3.  624

4.  1023

4

1023

Explanation :
No Explanation available for this question

# If n! = 40320, then n =

1.  24

2.  12

3.  8

4.  23

4

8

Explanation :
No Explanation available for this question

# 1 + 1 x 1! +2 x 2! + 3 x 3! +……+ n x n! =

1.  n!

2.  (n-1)!

3.  (n+1)!

4.  n x (n+1)!

4

(n+1)!

Explanation :
No Explanation available for this question

# I: In a ΔABC, if a=R tan A then b2+c2 = bc +a2 II: In a ΔABC, if a sin A= c cos B +b cos C then trian

1.  only I is true

2.  only II is true

3.  both I,II are true

4.  neither I and II is true

4

both I,II are true

Explanation :
No Explanation available for this question

# 1 /2! + 2 /3! + 3 /4! +……… n / (n+1)! =

1.  1 + 1 / n!

2.  1 – 1 /n!

3.  1 + 1/(n+1)!

4.  1 – 1/(n+1)!

4

1 – 1/(n+1)!

Explanation :
No Explanation available for this question

# I: In a ΔABC, if 4s(s-a) (s-b) (s-c) =a2b2 then it is right angled triangle II: In a ΔABC, if sin A+ sin B +sin

1.  only I is true

2.  only II is true

3.  both I,II are true

4.  neither I and II is true

4