Question
Find the number whose square is the sum of the cube of the first 5 natural numbers.
Answer: Option D
:
D
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:
D
The sum of first 5 natural numbers can be expressed as (n(n+1)2)2 where n = 5, which gives us
((5×6)2)2 =(302)2 = 152
Thus the cubes of first 5 natural numbers can be expressed as the square of 15.
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