Question 37 (ii) (Choice 2) - CBSE Class 10 Sample Paper for 2023 Boards - Maths Standard - Solutions of Sample Papers for Class 10 Boards

Last updated at Dec. 13, 2024 by Teachoo

If 1500 seats are to be arranged in the auditorium, how many seats are still left to be put after 10th row?

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Question 37 (ii) – Choice 2 If 1500 seats are to be arranged in the auditorium, how many seats are still left to be put after 10th row? We need to find how many seats are still left to be put after 10th row Thus, Seats left after 10th row = Total seats − Seats till 10th row = 1500 − S10 Finding S10 Now Sn = 𝑛/2 (2a + (n – 1)d) Putting n = 10, a = 30, d = 10 S10 = 𝟏𝟎/𝟐 (2 × 30 + (10 – 1) × 10) = 5 (60 + 9 × 10) = 5 (60 + 90) = 5 × 150 = 750 Now, Thus, Seats left after 10th row = 1500 − S10 = 1500 – 750 = 750

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