alleryA positive-ratio GP starts at 4 and its 5th term is 324. Find the ratio.
A2
B4
C3
D9
Answer & Solution
Correct answer: C. 3
4r⁴=324 gives r⁴=81, so the positive ratio is 3.
Keep practising Arithmetic & Geometric Progressions
Browse all Arithmetic & Geometric Progressions questions for ICSE Class 10, or explore more Mathematics topics.
Related questions
Match each Arithmetic Progression (AP) formula with its quantity:Match each AP selection strategy with the chosen symmetric variables:Match each sequence computation with its evaluated answer:Match each AP sequence with its common difference d:Insert two positive geometric means between 2 and 54. What is the first inserted?A GP starts a,ar,ar² with a,r>0. If a+ar=6 and ar+ar²=18, r equalsThree positive numbers are consecutive terms of both an AP and a GP. They must beAn asset keeps 80% of its value each year. Initially ₹500, its value after 3 years?