টেলিফোনের মোট কল সংখ্যা হল 'n' এবং প্রত্যেক কলের চার্জ হল 'p'। মোট কল চার্জ কত হবে?
A. n+p
B. n-p
C. n*p
D. কোনোটিই নয়
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সঠিক উত্তরঃ
C.
n*p
Explanation: মোট চার্জ = মোট কল সংখ্যা * প্রতি কলের চার্জ -> n*p
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