self Maths Puzzle

Dexter was born between October 6th and 10th (6th and 10th excluding). His year of birth is also known. What is the probability of Dexter being born on a Saturday?

A.

0 or 1/3

B.

1/7 or 3/7

C.

1/3 or 1/7

D.

Cannot be determined

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self Other Question

If n is a positive integer and (n + 1)(n + 3) is odd, then (n + 2)(n + 4) must be a multiple of which one of the following?

a.3
b.5
c.6
d.8
e.16
I forgot the last digit of a 7-digit telephone number. If 1 randomly dial the final 3 digits after correctly dialling the first four, then what is the chance of dialling the correct number?

A.

1/1001

B.

1/1000

C.

1/999

D.

1/990