CONCEPT:
Sum of the first n natural numbers =n(n+1)/2
SOLUTION:
-According to the question-
Sum of the first (x-1) natural numbers = Sum of natural number from (x+1) to 49.
So,
(x−1)(x)/2=(49×50)/2 - (x)(x+1)/2
⇒ 2x^2=49×50
⇒ x=7×5= 35 (C)
In a green view apartment, the houses of a row are numbered consecutively from 1 to 49. Assuming that there is a value of 'x' such that the sum of the numbers of the houses preceding the house numbered 'x' is equal to the sum of the numbers Print
Modified on: Tue, 12 Oct, 2021 at 12:20 PM
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