• Chandra dhawan thankyou
    see attachment dear
    • cropped1719606871649701809.jpg
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    Chandra dhawan
  • Mahak
    this depends on what is requirment of question when you will practice more and more question you will cone to know which formula is to be used .. there's not any hard and fast rule...
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  • Chandra dhawan
    Hope you get it
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