CDS I 2023 Elementary Mathematics Previous Year Paper (16-April-2023)

Question 1

What is the largest number which divides both 235 - 1 and 291 - 1 ?

Accepted Answer

127

Answer

34

Answer

90

Answer

129

Question 2

What is the largest power of 10 that divides the product 29 &times; 28 &times; 27 &times; ...2 &times; 1 ?

Accepted Answer

6

Answer

4

Answer

5

Answer

7

Question 3

What is the remainder when 6599 is divided by 11 ?

Accepted Answer

10

Answer

0

Answer

5

Answer

9

Question 4

If the roots of the equation x2 - bx + c = 5 differ by 5, then which one of the following is correct ?

Accepted Answer

b2 = 4c + 5

Answer

c2 = 4b - 5

Answer

b2 + c2 = 5

Answer

b2 - c2 = 5

Question 5

In a party of 150 persons, 75 persons take tea, 60 persons take coffee and 50 persons take milk. 15 of them take both tea and coffee, but no one taking milk takes tea. If each person in the party takes at least one drink, then what is the number of persons taking milk only ?

Accepted Answer

30

Answer

50

Answer

40

Answer

20

CDS I 2023 Elementary Mathematics Previous Year Paper (16-April-2023)

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