Question
The 8th term of a G.P is eight times of fifth term. What
will be the first term when its 6th is 64?Solution
Let first term is lsquo;arsquo; and common ratio is lsquo;rrsquo; for the given geometric sequence Here given a8 = 8 x a5 and also a6 = 64 rArr; ar8 - 1 = 8 x ar5 - 1 rArr; r7 = 8 x r4 rArr; r = 2 Now take a6 = 64 rArr; ar6-1 = 64 rArr; a25 = 64 rArr; a = 2
What should come in place of (?) question mark in the given number series.
81, 73, 66, 60, 55, ?
14 6 4 4 ? 48
...What should come in place of (?) question mark in the following number series.
5, 11, 23, 47, 95, ?
In each of the following number series, one term is missing. Find the missing term.
1, 4, 9, 16, 25, ?
What will come in place of the question mark (?) in the following series?
4, 11, 32, 95, 284, 851, ?
156, 182, 210, 240, 272, ?
31    32      35      ?      47       56
...What should come in place of (?) question mark in the following number series.
1, 2, 6, 24, 120, ?
What value should come in the place of (?) in the following number series?
71, 72, 76, 103, ?, 244254, ?, 1022, 1150, 1214, 1246
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