2npn+1:2n-2pn=56:3 sir please solve this - Maths - Permutations and Combinations

Question

2npn+1:2n-2pn=56:3 sir please solve this

Varun Rawat · Accepted Answer

Dear Student,

⇒34n2 - 2n = 56n - 56⇒12n2 - 6n - 56n + 56 = 0⇒12n2 - 62n + 56 = 0⇒6n2 - 31n + 28 = 0⇒6n2 - 24n - 7n + 28 = 0⇒6nn - 4 - 7n - 4 = 0⇒n - 46n - 7 = 0⇒n = 4   or   n = 76rejectedSo, n = 4