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Since a full wave rectifier will have two pulses in one full cycle (20ms) in output, its fundamental frequency of ripple will be 2*50 Hz i.e, 100Hz because for every 10ms one half cycle will repeat.

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the woman introduced the man as his wife is only daughter of her own father. It means that the woman is the wife of that person. Because her father has only one daughter so she is the daughter and wife of that man

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the order of seating is W S V Q P R T. 

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The order of seating is W S V Q P R T according to the instructions. So W is immediate left of S

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Order of seating of men is C E D B A 

order of seating of women M O P Q N 

so N is third to the right of O

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let tuhin share is 3*m rupees

then sushant  share is 5*m rupees and rita  share is 7*m rupees

Given 7*m-5*m = 4000 , therefore m=2000 Rs/-

sushant and tuhin share is equal to 3*m + 5*m = 8*m = 8*2000= 16,000 Rs

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Walk in east direction for 100kms (100kms right side) . Then towards north 80 kms (80kms upside). Then towards west 40kms (40kms left side). Distance from starting point is 100+80+40= 220kms , Displacement from starting point is the diagnol distance of 60, 80 kms which is equla to 100kms

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Rashid is the maternal uncle of Qasim, Mustaq is the maternal grandfather of Rashid means that rashid is grandson of mustaq, and qasim is great grand son of mustaq, Samim is the grandson of Mustaq means that samim and rashid are brothers. so samim will be maternal uncle for qasim

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it will take 12 more rotations before coming to stop

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the selling price of first article is 91 Rs/- and he had profit of 16.67% on that which mean the cost price of the first article is 91*100/116.67 = 78 Rs/-. The selling price of second article is 91 Rs/- with a loss of 12.5% which means that actual price of second article is 91*100/87.5 = 104 Rs/-. In entire transaction , total cost of articles is 182 Rs/- and total selling price of two articles is 182 Rs/- . so he didnt gain or loose any amount