1.

1). 7272). 7283). 7294). 730

Answer»

As we KNOW,

Sum of n natural NUMBERS = n(n + 1)/2

AVERAGE of n natural numbers = (n + 1)/2

Given, Average of n natural numbers = 243

⇒ (n + 1)/2 = 243

⇒ n + 1 = 486

⇒ n = 486 – 1 = 485

⇒ 3n = 3(485) = 1455

∴ Average of 3n natural numbers = (1455 + 1)/2 = 1456/2 = 728



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