You have 116m of lumber and want to make a border around your swimming pool. You contemplate the following shapes for the pool. Which of these shapes can be enclosed by 116m of lumber?
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sum of n nos: n(n+1)/2
let n=50
(50*51)/2=1275
(50-1)*(105/4)=1260
i.e(1275-1260)=15i.e (7+8)
other options will give u decimal numbers but sum of two consecutive number cannot be decimal
so, answer is 50
let n=50
(50*51)/2=1275
(50-1)*(105/4)=1260
i.e(1275-1260)=15i.e (7+8)
other options will give u decimal numbers but sum of two consecutive number cannot be decimal
so, answer is 50
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