Question # 1

The middle terms of (x+y)²³ are:

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T₁₀,T₁₁

T₁₁,T₁₂

T₁₂,T₁₃

none of these

For a positive integer n:

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(n+1)! = (n+1)n!

(n+1)! = (n+1)(n-1)!

n! = n(n+1)!

none of these

A dice is thrown. The probability to get an even number is:

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1

none of these

Tickets numbered 1 to 20 are mixed up and then a ticket is drawn at random. What is the probability that the ticket drawn bears a number which is a multiple of 3 ?

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none of these

No. of diagonals can be formed by joining the vertices of the polygon having 12 sides ?

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70

54

70

73

No. of signals made by 5 flags of different colors using 3 flags at a time is:

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60

15

10

None

Number of ways of arranging 5 keys in a circular ring is:

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12

24

6

5

A key ring is an example of:

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permutation

circulation permutation

combination

none

If a statement P(n) is true for n = 1 and truth of P(n) for n = k implies the truth of P(n) for n = k + 1, then P(n) is true for all:

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integers n

real numbers n

positive real numbers n

positive integers n

How many different number can be formed by taking 4 out of the six digits 1, 2, 3, 4, 5, 6:

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360

120

366

none of these

The factorial of positive integer is:

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rational no.

positive integer

real no.

none

A die is rolled. The probability that the dots on the top are greater than 4 is:

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5, 6

1

The number of ways in which fiver persons can sit at a round table is:

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4!

5!

none of these

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4

6

8

10

Numbers are formed by using all the digits 1, 2, 3, 4, 5, 6 on digit being repeated, then the numbers which are divisible by 5 are:

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110

120

122

124

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