What is the sum of the first five odd numbers?

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Q1.

Which of the following is the formula for the nth odd number?

Q2.

What is the next number in the sequence 1, 4, 9, 16?

Q3.

If the first five hexagonal numbers are 1, 6, 15, 28, 45, what is the sixth hexagonal number?

Q4.

What is the main focus of mathematics?