Questions

Dr. A Keshav Krishna, a scientist at the National Geophysical Research Institute (NGRI), has been selected for 2016 National Geoscience Award by the Ministry of Mines in the field of Geo-environmental studies in applied geosciences.

2+2=4

4+4=8

8+8=16

16+16=32 but  it is given 36

Starting from letter 'S' add 5 in the clock wise direction to get the next letter in English alphabets.

Here S + 5 => 19 + 5 = 24 => X

X + 5 = 24 + 5 = 3 => C

Similarly, 

B + 5 = G

Our solution:

Toss the coin twice.
Let TH, HT and TT correspond to the three choices.
And if you get HH, just repeat (so it takes 8/3 tosses on average).


BIASED COIN

If the coin was biased, TH and HT would occur with equal probability.
So you could assign THHT, HTTH and THTH to the three choices, with other 4-toss outcomes rejected.
Or you could assign HTT, THT and TTH to the three choices, with other 3-toss outcomes rejected.

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