the sum of a no. and its square is 240 the no. is.
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n*(n+1) = 240
Square root ((240*4)+1)
= 31
n+(n+1) = 31
So, 31÷ 2 = 15.50
And it is clear that:-
n = 15 (the number)
(n+1) = 16.
Think it helps.
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