x-y=10 এবং xy = 30 হলে x3-y3 এর মান কত?

A 1900

B 2000

C 2500

D 3000

Solution

Correct Answer: Option A

দেওয়া আছে, x-y = 10
xy=30
∴x3-y3= (x-y)3+3xy(x+y)
=103+3.30.10
=1000+900 = 1900

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