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How do i slove the maths

2*16!+1 is divisible by 19, so 16!+10 is divisible by 19...please explain this step

A shearing force 10 newton is applied on the top of a cuboid of height 0.1 m such that it becomes a parallelepiped. If the slant surface of the parallelepiped forms an angle of 30 degrees with the base, what is the work done by the force?

The set X has (2 m + 1) elements. The number of subsets of X having atleast one element and at the most 'm' elements is 16383. Find the value of m.

how to solve cloze test

how to give SSC mock in dis app

How to develop interest so as to read and understand the whole RC.?

137^(13^47)

what is the trick to deal with railway exams questions???

a test consists of 120 questions. each correct answer, each wrong answer and each unanswered question in the test carry 1 mark, -1/2 mark and -1/4 mark respectively. Find the maximum no of questions that the candidate could have answered wrongly in the test if he scores 50 marks in the test??? ANS=45.. PLEASE HELP WITH APPROACH