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# Archives: Doubt

## What processes would you consider essential for maintaining life?

## What are outside raw materials used for by an organism?

## What criteria do we use to decide whether something is alive?

## Why is diffusion insufficient to meet the oxygen requirements of multi-cellular organisms like humans?

## $$3^{x-1}+3^{3-x}=6$$ , then what is $$2^{x-1}+2^{3-x}$$Â equal to ?

## If $$x(a-b+\frac{ab}{a-b})=y(a+b-\frac{ab}{a+b}) and x+y=2a^3$$ , Â then what is x-y equal to ?

## Â Which one of the following is a factor of $$3\sqrt{3}x^3+2\sqrt{2}x^3-\sqrt{18}xy+6\sqrt{6}$$ ?

## What is number of digits in the expansion of $$125^{100}$$? (Given $$log_{10}2=0.301$$)

## What is the HCF ofacxÂ³ + bcxÂ² + adxÂ² + acdx + bdx + bcd and adxÂ³ + acxÂ² + bdxÂ² + bcx + acdx + bcd if HCF (c, d) = 1, c â‰ d?

## Â If the median of observations 12, 1, 8, 54, 61, 28, 45, 35, 21, 17 is M, then what is the value of 2M + 5 ?

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