Discussion

Explanation:

We know any number can be written as sum or different of powers of 3.

Let the minimum weights required by n.

∴ 30 + 31 + 32 + … + 3(n-1) ≥ 121.

⇒ (3n – 1)/2 ≥ 121

⇒ (3n – 1) ≥ 242

⇒ 3n ≥ 243

∴ least value of n = 5.

Hence, 5.

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