Book Maths Puzzle Numerical Ability

what is the probability starts with T in the word TIT

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Book Other Question

The sum of the digits of a two-digit number X is Y. The sum of the digits of X^2 is Y^2. Find X. The velocity of a falling object is a linear function of the time t it has been falling. If v = 20 when
t = 0 and v = 53 when t = 11, express v as a function of t.