Number Series Quiz For Upcoming Exams answers

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Solution :-

31. Answer is option D

Explanation:

1*1+2 = 3

3*2+4 = 10

10*3+8 = 38

38*4+16 = 168

    168*5+32 = 872

32.Answer is option D Explanation:

1+1³ = 2

2+2³ = 10

10+3³ = 37

37+4³ = 101

101+5³ = 226

33.Answer is option D

34. Answer is option C

Explanation:

5 x 0.5 + 0.5 = 3

3 x 1+ 1 = 4

4 x 1.5 + 1.5 = 7.5

7.5 x 2 + 2 = 17

    17 x 2.5 + 2.5 = 45

35. Answer is option A

Explanation:

9+11 = 20

11+20= 31

31+51= 82

82+51= 133

36. Answer is option B

5 + (1²) = 5 + 1 = 6

6 + (2²) = 6 + 4 = 10

10 + (3²) = 10 + 9 = 19

19 + (4²) = 19 + 16 = 35

35 + (5²) = 35 + 25 = 60

60 + (6²) = 60 + 36 = 96

37. Answer is option C
    Explanation:

24 + 2² = 24 + 4 = 28

28 – 3² = 28 – 9 = 19

19 + 4² = 19 + 16 = 35

35 – 5² = 35 – 25 = 10

10 + 6² = 10 + 36 = 46

38. Answer is option B

Explanation

2, 5, 9, 19, 37, …..              

The pattern is: every number is arrived at     

previous number multiplied by 2 and then alternate addition and subtraction by 1 i.e.

2

5=2×2+1

9=5×2-1

19=9×2+1

37=19×2-1

the next term 37×2+1 = 75

39. Answer is option B

Explanation:

9 = 4×2+1

17 = 9×2–1

35 = 17×2+1

69 = 35×2–1

139 = 69×2+1

    277 = 139×2–1

40. Answer is option C

Explanation:

5 × 1+12 =5+1=6

6 × 2 + 22 = 12 + 4 = 16

16 × 3 + 32 = 48 + 9 = 57

57 × 4 + 42 = 228 + 16= 244

    244 × 5 + 52 = 1245