From a pack of 52 cards, two cards are drawn together at random. What is the probability of both the cards being kings?
Let S be the sample space
Then, n(S) = 52C2= 1326.
Let E = event of getting 2 kings out of 4.
n(E) = 52*512*1= 6.
4C2
=>4*32*1
P(E)=n(E)n(S)=61326=1221
If the standard deviation of 0, 1, 2, 3 ......... 9 is K, then the standard deviation of 10, 11, 12, 13 ........... 19 will be:
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