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D₅ সেলে মোট ব্যয়ের সূত্রটি হবে-

= (D_{2} + D_{3} + D_{4}) / 3

= (D_{2} * D_{3} * D_{4})

= (D_{2} + D_{3} + D_{4}) * 3

= (D_{2} + D_{3} + D_{4})

ANS : 4

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