Q-1 7x36- 3615 = 4321, Find x

(a) 6 (b) 9 (c) 8 (d) 10

Q-2 If largest two digits number in subtracted from smallest three digits numbers them find the value.

(a) 2 (b) 1 (c) 4 (d) 9

Q-3 Find the sum of natural no. from 1to 30

(a) 460 (b) 465 (c) 471 (d) None

Q-4 How many even prime numbers are these which are last then 10.

(a) 1 (b) 2 (c) 3 (d) 4

Q-5 Which is smallest even prime number?

(a) 2 (b) 4 (c) 6 (d) 8

Q-6 Find the sum of prime no. between 10to 20?

(a) 30 (b) 60 (c) 80 (d) 90

Q-7 8+27+64+---------1000

(a) (106)2 - 1 (b) (105)2-1 (c) (105)2+1 (d) None

Q-8 1+4+9+-----------+100

(a) 1165 (b) 1155 (c) 1168 (d) None

Q-9 41+42 +-----------+60

(a) 1011 (b) 1010 (c) 1120 (d) None

Q-10 3(199×199)

(a) 120203 (b) 121315 (c) 121203 (d) None

Q-11 136532 is Divisible by

(a) 9 (b) 11 (c) 18 (d) 25

Q-12 In 9×6 find the value of x if It in divisible by 4

(a) 3 (b) 4 (c) 6 (d) None

Q-13 Difference of two consecutive even numbers is always divisible by

(a) 24 (b) 12 (c) 36 (d) None

Q-14 Ö-25 = ?

(a) 6; (b) 5 (c) 5; 2 (c) 5;

Q-15 What is value of =?

(a) Ö-25 (b) Ö-1 (c) Ö-9 (d) None

Q-16 From the following which nearest to 561which is divisible by 5

(a) 560 (b) 565 (c) 569 (d) None

Q-17 If two number are in 3:5

(a) 21, 35 (b) 21, 40 (c) 21, 63 (d) None

Q-18 Sum of two no. in 38 &they are in ratio of 2:17, find the largest no.

(a) 30 (b) 34 (c) 24 (d) None

Q-19 Find 50th term 12+14 + 18+ --------

(a) 112 (b) 110 (c) 114 (d) None

Q-20 4x/9 +3x/7=?

(a) 55x/62 (b) 55x/63 (c) 55x/66 (d) None

Q-21 Which value we have to add in 515 so that it in completely divided by 3

(a) 6 (b) 1 (c) 3 (d) 9

Q-22 Let x+y=13 & x-y =3 find x2-y2

(a) 40 (b) 36 (c) 39 (d) 50

Q-23 If 155 in divided by 3 them we obtain 9 as remainder, them what

Will be its quotient?

(a) 40 (b) 36 (c) 30 (d) None

Q-24 (2/3)n = 16/87

(a) 4 (b) 5 (c) 6 (d) 8

Q-25 Find unit digit is 365×721×615×411

(a) 6 (b) 5 (c) 8 (d) 9

Answer:-

1 (b) 9

2 (b) 1

3 (b) 465

4 (a) 1

5 (a) 2

6 (b) 60

7 (b) (105)2-1

8 (b) 1155

9 (b) 1010

10 (c) 121203

11 (b) 11

12 (a) 3

13 (b) 12

14 (c) 5;

15 (b) Ö-1

16 (a) 560

17 (a) 21, 35

18 (b) 34

19 (b) 110

20 (b) 55x/63

21 (b) 1

22 (c) 39

23 (c) 30

24 (a) 4

25 (b) 5

Reasons:-

1 4321+3615 = 7×36

2 100-99= 1

3 1+2+3+--------+30=å 30

= 30(30+1)/2

= 15(31) = 465

5 Here only even prime no. = 2

6 11, 13, 17, 19

There sum = 60

7 (13+23+33+43+-----------+103) -13

=å103 -1

= (10(10+1)/2)2 -1

= (5(21)2) -1

= (105)2

8 å102= 10(10+1) (2(10) +1)/2

= 5(11) (21) =1155

9 [(1+2+3+--------+40) +(41+42+-------+60)]-[1+2+ ------+40]

= å60 - å40

= 60(60+1)/2 - 40(40+1)/2

= 30(61) - 20(41)

= 1830 - 820 = 1010

10 3(1997)2 =(200-1)2

= 3(40000+1-400)

= 3(40400+1)

= 3 (40401) = 21203

11 Sum of digit at odd place = 5+2+3 =10

Sum of digit at even place= 6+3+1=10

Diff =10-10=0

\ it in divisible by 11

12 936 If last two digit no. are divisible 4

14 Ö-25

=Ö-1 Ö25

= i (5) = 5i

16 When 561 in divided by 5

Them remainder in 5

Them after adding on

Subtracting we obtain 565&560

\ 560 in more nears to 561

17 Let no. are 3x&5x

3x+ 5x =56

8x =56

x = 7

18 2x +17x= 38

19x =38

X=L

\ No. are 4&34

\ Largest no. in 34

19 Here a= 121 r=2

\T50 = a +(n-1) d

T50 = 12+ (49)2

= 12+98= 98 =110

20 28x/62+27x/63 = 55x/63

22 x2-y2=(x-y) (x-y)

= (13) (3) = 39

23 5 155/5 f

\ 155=5f+5

= 150 = 5f

30 = f

25 5×1×5×1

=25 = 5

## Thursday, April 23, 2009

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