railway RRB JE (CBT I + CBT II) Mock Test 2024 Quantitative Aptitude Algebra Identities

નીચેના સમીકરણને સરળ બનાવો.

(2a - b - 3c)(4a2 + b2 + 9c2 + 2ab + 6ac - 3bc)

1
8a3 + b3 + 27c3
2
8a3 - b3 - 27c3 + 18abc
3
-8a3 + b3 + 27c3
4
8a3 - b3 - 27c3 - 18abc
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