Teaching UP TGT Mock Test Series 2025 Mathematics Sequences and Series Geometric Progressions

If a, b, c, d are in G.P., then (a3 + b3)–1, (b3 + c3)–1, (c3 + d3)–1 are in - 

1
A.P. 
2
G.P.
3
H.P.
4
None of these
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