a3 - 21a - 20 রাশিটির একটি উৎপাদক হবে নিচের কোনটি?

A

(a + 1)

B

(a − 1)

C

(a + 2)

D

(a − 2)

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Updated: 1 month ago

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D

(a - b) (a2 - 2ab + 2b2)

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