WBCS 2021 Mains (General Studies Paper-IV) Prev. Yr. Paper (24-May-2022)

A survey shows that $73\%$ of the Indians like apples, whereas $65\%$ like oranges. What percentage of Indians like both apples and oranges?

If the length of shadow on the ground of a post is $\frac{1}{\sqrt{3}}$ times of its height, the angle of elevation of the Sun is:

ulna : forearm $::$ tibia : ?

A man borrows $\text{Rs. }2,550$ to be paid back with compound interest at the rate of $4\%$ per annum by the end of $2$ years in two equal yearly instalments. How much will each instalment be?

Direction: Study the following information carefully and answer the question given below.
An algorithm rearranges a sequence of numbers following a specific rule in each step. Following is an illustration of input and the subsequent steps of rearrangement.

Input: $983106726359361284$
Step 1: $983136726359061284$
Step 2: $843136726359061298$
Step 3: $843136637259061298$
Step 4: $843112637259063698$

New Input: $315906728412369863$
Which step will be $635936847212069831$?