Read the following lines carefully and answer the questions that follow.
I am dotted silver threads dropped from heaven By the gods. Nature then takes me, to adorn Her fields and valleys.
I am beautiful pearls, plucked from the Crown of Ishtar by the daughter of Dawn To embellish the gardens.
The rain calls itself the 'dotted silver threads' as
Let $$a_n$$ be a sequence of numbers which is defined by relation $$a_1=2, \frac{a_n}{a_{n+1}}=3^{-n}$$, then $$\log _2\left(a_{50}\right)$$ is equal to (take $$\log _2 3=1.6$$ )
The value of $$\frac{1}{2}\left(\frac{1}{5}\right)^2+\frac{2}{3}\left(\frac{1}{5}\right)^3+\frac{3}{4}\left(\frac{1}{5}\right)^4+\ldots . . \infty$$ is
Out of 9 consonants and 4 vowels, how many words of 4 consonants and 3 vowels can be formed?