self Maths Puzzle

Find the remainder when 289 is divided by 89?

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self Other Question

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 A boy writes all the numbers from 100 to 999. The number of zeroes that he uses is 'a', the number of 5's that he uses is 'b' and the number of 8's he uses is 'c'. What is the value of b+c-a?