defence exam Agniveer Vayu Group X & XY Mock Test 01/2026 Mathematics Sequences and Series Arithmetic Progressions
If α, β be roots of x2 – x – 1 = 0 and An = αn + βn, then Arithmetic Mean of An–1 and An is
1
2An+1
2
(1/2)An+1
3
2An–2
4
none of these