Question

two boys are asked to select each one number from one to hundred the probability that they select different numbers​

Answer 1

Answer:

..

Step-by-step explanation:

1/2.....

only one number is needed..

because 2 boys...

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Answer 2

Probability$= \frac{ 100\times 99}{^{100}C_2}$  

Explanation:

First boy can choose one number from 1 to 100 so number $P_1 = ^{100}C_1$

And another can choose one different number from the 99 numbers so different number $P_2 = ^{99}C_1$

So the total number of choosing different numbers $= P_1\times P_2$  

$Probability = \frac{ P_1\times P_2}{^{100}C_2}$  

$Probability = \frac{ 100\times 99}{^{100}C_2}$