exam Maths Puzzle Numerical Ability

How do I write this serie using sigma notation?

1/2 + 2/3 + 3/4 + ... 99/100

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exam Other Question

The sum of the digits of two- digit numbers is 10. if the digits are reversed, the new number is 54 less than the original number. Find the original number. The sum of a two-digit number and its reverse is 121. The ones digit is seven more than the tens digit.what is the number?