Camp exam problem 12

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*Mahi*
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Camp exam problem 12

Unread post by *Mahi* » Fri Nov 04, 2011 11:38 pm

Let $a;b;c;d$ be positive numbers such that $a \leq 1 , a+b \leq5 , a+b+c \leq 14 , a+b+c+d \leq 30$ . Prove that,
\[\sqrt{a} + \sqrt{b} + \sqrt{c} + \sqrt{d} \leq 10\]
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Re: Camp exam problem 12

Unread post by nafistiham » Sat Nov 05, 2011 12:32 am

আচ্চা, অসমতাতে যোগ বিয়োগ আর ধনাত্মক হলে বর্গমূল করা যায় না?
যদি করা যায় তাহলে এ সমস্যাটা মনে হয় শেষ সমস্যা হওয়ার কথা না।
আর যদি না হয় তাহলে তো .................. :cry:
\[\sum_{k=0}^{n-1}e^{\frac{2 \pi i k}{n}}=0\]
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*Mahi*
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Re: Camp exam problem 12

Unread post by *Mahi* » Sat Nov 05, 2011 1:11 am

Subtraction is not allowed.
Example:$3>2...(i)$ and $5>1...(ii)$,
$i-ii$ implies $-2>1$.
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Re: Camp exam problem 12

Unread post by nafistiham » Sat Nov 05, 2011 1:21 am

জানতাম কিছু না কিছু একটা ঝামেলা আছে। হেহে
তাইতো বলি এত সহজ কেন?

আহহারে এত আশা নিয়া সল্ভ করলাম্মম্মম :cry: :cry: :cry: :cry:
\[\sum_{k=0}^{n-1}e^{\frac{2 \pi i k}{n}}=0\]
Using $L^AT_EX$ and following the rules of the forum are very easy but really important, too.Please co-operate.
Introduction:
Nafis Tiham
CSE Dept. SUST -HSC 14'
http://www.facebook.com/nafistiham
nafistiham@gmail

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