Mathematics · Binomial Theorem
If the coefficients of 2nd, 3rd and 4th terms in the expansion of (1 + x)2n are in Arithmetic Progression (A.P.), then:
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- 12n2 + 9n - 7 = 0
- 22n2 - 9n - 7 = 0
- 32n2 - 9n + 7 = 0✓
- 42n2 + 9n + 7 = 0
Correct answer
2n2 - 9n + 7 = 0
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