Number Trick Puzzle

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Sonal asked the class to see if they could find the sum of the first 50 odd numbers. As everyone settled down to their addition, Lavesh ran to her and said, ‘The sum is 2,500.’ Ms Sonal thought, ‘Lucky guess,’ and gave him the task of finding the sum of the first 75 odd numbers. Within 20 seconds, Lavesh was back with the correct answer

How does Lavesh find the sum so quickly and what is the answer?

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  • 1 Answer(s)

    Sum of terms of arithmetic progression. (First Term = 1, consistent difference = 2)

    For 75 terms of the odd number sequence, the sum will be 5625.

    Viji_Pinarayi Expert Answered on 8th October 2024.
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