.If a-b=1 and a3-b3 = 61, then the value of ab
will be
1). -20
2). 20
3). 30
4). 60
basket contains 300 mangoes . 75 mangoes were distributed among some students . Find the percentage of mangoes left in the basket
1). 70%
2). 72%
3). 76%
4). 75%
.The least value of $tan^{2}x+cot^{2}x$ is
1). 3
2). 2
3). 0
4). 1
$If\ (2x+\frac{2}{9x})=4,\ then\ the\ value\ of\ 27x^{3}+ \frac{1}{27x^{3}}\ is $
1). 180
2). 198
3). 234
4). 252
A hollow hemispherical bowl is made of silver with its outer radius 8 cm and inner radius 4 cm respectively. The bowl is melted to form a solid right
circular cone of radius 8 cm. The height of the cone formed is
1). 7 cm
2). 9 cm
3). 12 cm
4). 14 cm