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The odd natural numbers have been divided in groups as (1,3) ; (5,7,9,11) ; (13,15,17,19,21,23),..........

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The odd natural numbers have been divided in groups as

(1,3) ; (5,7,9,11) ; (13,15,17,19,21,23),.......... Then the sum of numbers in the 10th group is

1. 4000 

2. 4003 

3. 4007 

4. 4008

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1 Answer

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Best answer

Correct option: (1) 4000

Explanation:

General Term = n (2n)2 (For sum)

= 4n × n2 = 4n3

∴ In 10th group sum = 4 × 103 = 4000

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