After 5 mins ..... 3 persons will get rumour
After 10 mins .... 3x2 + 3 = 9 =
persons will get
after 15 =5x3 min ......9x2 + 9 =27 =
persons will get news.
.
.
after 5x6 mins ...
= 729 persons will get news.
Therefore, time taken to spread the rumour to 729 persons is 30 minutes.
In all the numbers except 383, the middle digit is the product of the other two digits.
All are multiple of 3 except 83.
Similarly, 32:112:(2/7)
32 ? 3 x 2 = 6
'Uneasy' and 'Quiet' are opposite to each other. Likewise, 'Fit' and 'Unfit' are opposite to each other
Belief is a different word from others.
It is not necessary that A is a clerk though he is poor.
All are insects.
Except 'Sodium' all other are radioactive.
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