The nth odd number is given by the formula 2n – 1. For example, the 1st odd number is 1, the 2nd is 3 and so on. This formula helps in calculating square numbers as sums of odd numbers.
Class 8 Mathematics Textbook Chapter 1 A Square and A Cube question answer
Class 8 Mathematics Chapter 1 A Square and A Cube solutions
To find the nth odd number, we use the formula 2n – 1. This means if you want the 5th odd number, it would be 2×5 – 1 = 9. This formula is important because square numbers are formed by the sum of the first n odd numbers. For example, the sum of the first 4 odd numbers (1 + 3 + 5 + 7) equals 16, which is 4².
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