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Placement Papers Infosys Paper - III Page: 2
34750.3,4,7,10,13,16,19,22, . . . Find 10th term in series
26
28
24
22
Explanation:

3

3x1 = 3 + 1 = 4

3x2 = 6 + 1 = 7

3x3 = 9 + 1 = 10

3x4 = 12 + 1 = 13

3x5 = 15 + 1 = 16

3x6 = 18 + 1 = 19

3x7 = 21 + 1 = 22

3x8 = 24 + 1 = 25

3x9 = 27 + 1 = 28

10th term = 28

34751.y, _?, q, m, i
w
u
t
l
Explanation:

Difference of 3 is in between two alphabets

i + 3 = m (j,k,l)

m + 3 = q (n,o,p)

q + 3 = u (r,s,t)

u is the answer.

34752.What is the next number in the series 3,7,13,19....
27
24
25
29
Explanation:

Prime numbers from 3 on wards are 3, 5, 7, 11, 13, 17, 19, 23, 29 . . .

Write alternate primes numbers starting from 3.

3, 7, 13, 19, 29

Answer is 29

34753.Marbles are to be distributed. Ann gets 1,Mary gets 2, Rose gets 3 and Lisa gets 4. John Brown gets as much as his sister.Tim Smith gets 2 times as much as his sister. Neil Johnson gets 3 times as much as his sister. Sam Paul gets 4 times as much as his sister.Find the surnames of Ann,Mary,Rose and Lisa ?
36
32
34
38
Explanation:

Anns brother is Neil John (1 x 3=3).

Mary s brother Sam paul ( 2 x 4=8).

Roses brother John Brown (3 x 1=3).

Lisas Brother is Tim Smith (4 x 2 = 8).

1 + 2 + 3 + 4 + 3 + 8 + 3 + 8 = 32

34754.Joe`s age, Joe`s sister`s age and Joe`s fathers age sums up to a century. When son is as old as his
father, Joe`s sister will be twice as old as now. When Joe is as old as his father then his father is twice as old as when his sister was as old as her father.Age of her father ?
60
50
65
55
Explanation:

Joe + sister + father = 100

After x years let us consider Joe`s age is equal to his father

Joe + x = father

Therefore,

sister + x = 2 x sister

$\Rightarrow$ sister = x

Joe + sister = father

Therefore,

2 $\times$ father = 100

Hence, Father = 50

34755.X Z Y + X Y Z = Y Z X.
X = 5, Y = 4, Z = 9
X = 9, Y = 5, Z = 4
X = 5, Y = 9, Z = 4
X = 4, Y = 9, Z = 5
Explanation:

Find the three digits

2nd column, Z + Y = Z shows a carry so, Z + Y + 1 = 10 + Z

$\Rightarrow$ Y = 9

1st column, X + X + 1 = 9

$\Rightarrow$ X = 4 so, Z = 5

459 + 495 = 954

X = 4, Y = 9, Z = 5

34756.An escalator is descending at constant speed. A walks down and takes 50 steps to reach the bottom. B runs down and takes 90 steps in the same time as A takes 10 steps. How many steps are visible when the escalator is not operating?
100
200
300
150
Explanation:

Lets suppose that A walks down 1 step / min and

escalator moves n steps/ min

It is given that A takes 50 steps to reach the bottom

In the same time escalator would have covered 50n steps

So total steps on escalator is 50 + 50n.

Again it is given that B takes 90 steps to reach the bottom and time

taken by him for this is equal to time taken by A to cover 10 steps

i.e 10 minutes. So in this 10 min escalator would have covered 10n steps.

So total steps on escalatro is 90 + 10n

Again equating 50 + 50n = 90 + 10n we get n = 1

Hence total number of steps on escalator is 100.

34757.There are 8 digits and 5 alphabets.In how many ways can you form an alphanumeric word using 3 digits and 2 alphabets?
43500
43200
54300
43100
Explanation:

Select 3 digits from 8 digits i. e.

8C3 ways

And also select 2 alphabets from 5 alphabets i.e.,

5C2 ways

Now to form a alphanumeric word of 5 characters we have to arrange the 5 selected digits.

So the answer is .

8C3 $\times$ 5C2 $\times$ 5! = 43200

34758.In an Octagon the number of possible diagonals are?
60
40
30
20
Explanation:

Formula : Number of diagonals for n sided regular polygon = $^nC_{2}$ - n

For Octagon n = 8

Number of diagonals = $^8C_{2}$ - 8 = 20

34759.What is the next number of the following sequence 7, 14, 55, 110, _ ?
163
144
121
155
Explanation:

In that sequence first number is 7

7 + 7 =14

14 + 41 = 55

55 + 55 = 110

110 + 011 =121

Next number in that sequence = 121

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