Question
Find the unit digit of (57 129 Â -
7).Solution
Cyclicity of 7 = 7, 9, 3, 1, 7
Hence, we can see the last digits repeat themselves after every power of '4'.
So, unit digit of 57 129 Â = units digit of 7 (128 + 1)Â = 7 {Since, (128/4) = 32}
So, unit digit of 57 129 Â - 7 = unit digit of 7 1 Â - 7 = 7 - 7 = 0
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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