TCS Company Logical Reasoning General Mental Ability

Does any one remember the question based on SNAIL, which walks 1 inch in a second and double its speed in every 1 sec, what was the correct answer of that,?

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TCS Other Question

If a_n=n, n>or=1 and b_n=a_n, n=-1 for odd and n=1 for even number. Find the average of first 10000 numbers. Based on which score i.e analytical ability or verbal ability TCS will select for further round..can any explain me please.