Question
How many terms are there in the geometric progression 4,
20, 100...... 62500?Solution
First term (a) = 4  common differences (r) = 20/ 4=5 T = 62500 Tn = arn-1 62500=4× (5)n-1 625×25 = (5)n-1 56 = (5)n-1 n-1=6 n=7 Hence the number of terms (n) = 7
What will come in place of the question mark (?) in the following series?
1528, 1416, 1204, ?, 480, -32
143 Â Â Â Â 119Â Â Â Â 107Â Â Â Â 101Â Â Â Â Â 98Â Â Â Â ?
96 89 ? 90 94 91
...What value should come in the place of (?) in the following number series?
19, 235, 260, 324, 333, ?
What will come in place of the question mark (?) in the following series?
305...
In each of the following number series, one term is missing. Find the missing term.
3, 5, 20, 24, 144, 150, ?
1029, 1030, 1039, 1064, ?, 1194
75, 80, 95, ?, 155, 200
What will come in place of the question mark (?) in the following series?
1515, 184, ?, 455, 967, 624
7 29 61 ? 211 349
...
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