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+1 vote
50.1k views
in Mathematics by (51.7k points)
How many terms of the series 54, 51,48 ....... be taken so that, their sum is 513 ? Explain the double answer.

1 Answer

+2 votes
by (266k points)
 
Best answer

Clearly, the given sequence is an AP with first term a: 54 and common difference d = -3. Let the sum of n terms be 513. Then.

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