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8. The sum of all two digit odd numbers is (a) 2575 (b) 2475 (c) 2524 (d) 2425

8. The sum of all two digit odd numbers is
(a) 2575
(b) 2475
(c) 2524
(d) 2425

Grade:12th pass

1 Answers

Pawan Prajapati
askIITians Faculty 8740 Points
3 months ago
Answer: b Explaination:Reason: All two digit odd numbers are 11,13,15,… 99, which are in A.P. Since there are 90 two digit numbers of which 45 numbers are odd and 45 numbers are even ∴ Sum = 452[11 + 99] = 452 × 110 = 45 × 55 = 2475

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