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What is the number of triples $(a, b, c)$ of positive integers such that $(i)$ $a < b < c < 10$ and $(ii)$ $a, b, c, 10$ form the sides of a quadrilateral?

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Questions featured in Previous Year Papers on Previous Year Papers

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IMPORTANT

Non-Routine Mathematics Resource Book-2 for PRMO>Chapter -1 - Previous Year Papers>Exercise 1>Q 30

For any real number

x,

let

[x]

denote the integer part of

x; {x}

be the fractional part of

x .

(\{x\} = x - [x])

. Let

A

denote the set of all real numbers

x

satisfying

\{x\} = \frac{x + [x] + [x + (\frac{1}{2})]}{20}

. If

S

is the sum of all numbers in

A,

find

[S]

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Non-Routine Mathematics Resource Book-2 for PRMO>Chapter -1 - Previous Year Papers>Exercise 1>Q 29

Let

A B C

be an acute angled triangle with

A B = 15

and

B C = 8 .

Let

D

be a point on

A B

such that

B D = B C .

Consider points

E

A C

such that

∠ D E B = ∠ B E C .

α

denotes the product of all possible values of

A E,

find

\frac{[α]}{10}

, where

[α]

is the integer part of

α .

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Non-Routine Mathematics Resource Book-2 for PRMO>Chapter -1 - Previous Year Papers>Exercise 1>Q 28

In a triangle

A B C,

it is known that

∠ A = 100 °

and

A B = A C .

The internal angle bisector

B D

has length

20

units. Find the length of

B C

to the nearest integer, given that

\sin 10 ° \approx 0.174 .

HARD

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Non-Routine Mathematics Resource Book-2 for PRMO>Chapter -1 - Previous Year Papers>Exercise 1>Q 27

A conical glass is in the form of a right circular cone. The slant height is $21$ and the radius of the top rim of the glass is $14$ . An ant at the mid-point of a slant line on the outside wall of the glass sees a honey drop diametrically opposite to it on the inside wall of the glass (See the figure.). If $d$ the shortest distance it should crawl to reach the honey drop, what is the integer part of $d ?$ (ignore the thickness of the glass.)

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Non-Routine Mathematics Resource Book-2 for PRMO>Chapter -1 - Previous Year Papers>Exercise 1>Q 26

A friction-less board has the shape of an equilateral triangle of side length

1

meter with bouncing walls along the sides. A tiny super bouncy ball is fired from vertex

A

towards the side

B C .

The ball bounces off the walls of the board nine times before it hits a vertex for the first time. The bounces are such that the angle of incidence equals the angle of reflection. The distance travelled by the ball in meters is of the form

\sqrt{N},

where

N

is an integer. What is the value of

N ?

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Non-Routine Mathematics Resource Book-2 for PRMO>Chapter -1 - Previous Year Papers>Exercise 1>Q 25

Let

A B C

be an isosceles triangle with

A B = B C .

A trisector of

∠ B

meets

A C

D .

A B, A C

and

B D

are integers and

A B - B D = 3,

find

A C

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Non-Routine Mathematics Resource Book-2 for PRMO>Chapter -1 - Previous Year Papers>Exercise 1>Q 24

For

n \geq 1,

let

a_{n}

be the number beginning with

n 9's

followed by

744;

e.g.,

a_{4} = 9999744 .

Define

f (n) = \max \{m \in N ∣ 2^{m} divides a_{n}\}

for

n \geq 1 .

Find

f (1) + f (2) + f (3) + \dots \dots . + f (10)

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Non-Routine Mathematics Resource Book-2 for PRMO>Chapter -1 - Previous Year Papers>Exercise 1>Q 22

In parallelogram

A B C D, A C = 10

and

B D = 28 .

The points

K

and

L

in the plane of

A B C D

move in such a way that

A K = B D

and

B L = A C .

Let

M

and

N

be the midpoints of

C K

and

D L,

respectively. What is the maximum value of

\cot^{2} (\frac{∠ B M D}{2}) + \tan^{2} (\frac{∠ A N C}{2})

What is the number of triples (a,b,c) of positive integers such that (i) a<b<c<10 and (ii) a, b, c, 10 form the sides of a quadrilateral?

Questions featured in Previous Year Papers on Previous Year Papers

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What is the number of triples $(a, b, c)$ of positive integers such that $(i)$ $a < b < c < 10$ and $(ii)$ $a, b, c, 10$ form the sides of a quadrilateral?