Shortcut Techniques


Do you know how to solve the following?

1. What is the remainder when ${2^{1990}}$ is divided by 1990?

2. What are the last two digits in the expansion of ${1947^{1947}}$

3.  In how many ways 5 distinct balls can be distributed to 3 distinct boxes, If each box must take minimum one ball?

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Some sample shortcut technique videos:

1. To Calculate fractions fast:



2. To find the correct option when options given closely:



3. To find on which weekday the given date falls, when a reference date given: