The 2nd, 4th, 7th digits are 3, 1, 6 respectively.
The perfect square of a two-digit odd number, formed using these digits, is 361
and 361 = 19^2
It is irrelavent
Clearly, though all the alternatives may form a part of the atmosphere, the air is the most vital part, without which there can be no atmosphere. So, the answer is (b).
It is true
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