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x 2 + 2 i.e. 8 x 2 + 2 = 16+2 = 18, x 2 + 4 i.e. 18 x 2+ 4 = 36+4 = 40, x 2 + 6 i.e. 40 x 2 + 6 = 80+6 = 86, x 2 + 8 i.e. 86 x 2 + 8 = 172+8 = 180, x 2 + 10 i.e. 180 x 2 + 10 = 360+10 = 370, x 2 + 12 i.e. 370 x 2 + 12 = 740+12 = 752.

Hence, the number 178 is wrong, and it should be replaced by 180.

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4) Find out the missing number in the following sequence. 53, 44, 52,?, 51, 46.

To get the next number in the given series go on subtracting prime numbers 19, 17, 13, 11, 7, and 5 from the numbers. Like: 125 – 19 = 106 106 – 17 = 89 89 – 13 = 76 76 – 11 = 65 65 – 7 = 58 58 – 5 = 53

So, the wrong number in the series is 88.

7) What should come in place of the question mark (?) in the following number series: 4, 5, 14, 51, ?

The sequence in first series is + 10, + 20, + 30, and the sequence in second series: -10, -20. So, the number 455 is wrong as it should be 415 – 30 = 385

9)

i) 264 136 72 40

ii0 488 (a) (b) (c) (d) (e)

Which of the following numbers will come in place of (a)?