ya file link dya
samationsa plus ker latain
is terha
minus
kis terha karian or divide
4 formula bata da

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http://picpaste.com/samation-U9fO9tW4.PNG

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http://picpaste.com/samation-U9fO9tW4.PNG

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PHP Code:
http://picpaste.com/samation-U9fO9tW4.PNG