Question

a coin is tossed 20 times what is probablity of gettin atleast 1 head​

Answer 1

Answer:

After tossing a coin two outcomes are possible viz. Heads and tails.Since 20 coins are tossed the total number of outcomes possible are 2^20. There will be exactly one case in which no heads show up. Therefore number of outcomes with at least 1 heads is (2^20–1).

Therefore the probability of getting at least one heads is (2^20–1/2^20) = 1048575/1048576 = 0.9999990463