exam Maths Puzzle Numerical Ability

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?

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exam Other Question

How do I write this serie using sigma notation?

1/2 + 2/3 + 3/4 + ... 99/100
x^2y^2+3x^2y-4x^2