Post formulas related to train and boat stream

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Please give the shortcuts of reasoning and a...

Narvas system

What will come at ghe place of blank!!!

What will come at blank???

ans:(a)

Explain 19,20,21

F(x)=cisπ/x increas in

If 2a+3b+6c=0;then the equation ax²+bx+c=0 h...

Can you give solution for this problem?

Please provide solution to this question.