Question
Determine the unit digit of (23334 x
17724).Solution
ATQ,
Cyclicity of ‘3’ = ‘4’ (i.e. 3, 9, 7, 1) So, it repeats after every fourth power of ‘3’. Since, 23334 = 233(32 + 2) So, unit digit of 23334 = 9 And, cyclicity of ‘7’ = ‘4’ (i.e. 7, 9, 3, 1) So, it repeats after every fourth power of ‘7’. So, the unit digit of 17724 = 1 {Since, 24 is completely divisible by 4} So, required unit digit = 9 × 1 = 9
5 11 23 43 85 171 341
...5000, 4050, 3240, 2268, 1360.8, 680.4
Find the wrong number in given series.
1868, 1875, 1883, 1946, 1980, 2185
Find the wrong number in the given number series.
2, 22, 58, 131, 276, 565
- Find the wrong number in the given number series.
8, 16, 32, 70, 128, 256 Find the wrong number in the given number series.
204, 215, 277, 337, 416, 518- Find the wrong number in the given number series.
3, 15, 18, 54, 56, 51 1 Â Â Â Â Â Â 3 Â Â Â Â Â Â 7 Â Â Â Â Â Â Â 15 Â Â Â Â Â Â Â 33
...15, 42, 56, 183, 219, 562Â
86,142, 232, 364, 547
