MATHS LET'S TRY

Discriminant of px^2 + qx + r = 0

•  $q^2-4pr$  

• $\sqrt{ }$  $q^2-4pr$  
  

•  $p^2-4qr$  

•  $r^2-4pq$  
  

Mean of first five odd number is

• 5

• 7

• 6

• 9

Distance between 

 $A\ \left(5\cos\theta,\ 0\right)$  and  $B\ \left(0,\ 5\sin\theta\right)$  

• 1 unit

• 5 units

• 10 units

• 50 units

From a solid cylinder of height h and diameter 2r, a conical cavity of same height and same diameter is hollowed out then total surface area of remaining solid is

• $2\pi rh\ +\ 2\pi r^2\ +\ \pi rl$

• $2\pi rh\ +\ 2\pi r^2\ -\ \pi rl$

• $2\pi rh\ +\ \pi r^2\ +\ \pi rl$

• $2\pi rh\ -\ 2\pi r^2\ +\ \pi rl$

Empirical relation between mean, median, mode is

• 3 Mean = Mode + Median

• 3 Mean = Mode - Median

• Mode = 3 Median - 2 Mean

• 3 Mode = 3 Mean - Median

Median of first six prime numbers is

• 6.6

• 5

• 6

• 7

Perimeter of semi circle with radius 7 cm is

• 22 cm

• 36 cm

• 78 cm

• 44 cm

Area of sector of a circle of radius 14 cm and length of arc 20 cm is

• 280 cm²

• 140 cm²

• 350 cm²

• 70 cm²

Area of triangle with vertices (0,-3), (0,0), and (2,0) is

• 6 cm²

• 3 cm²

• 5 cm²

• 10 cm²

After how many places will the decimal expansion of 189/125 terminate

• 2

• 3

• 4

• 5