Number Series


Direction: In each of the following questions a number series is given. A number is given after the series and then (a), (b), (c), (d) and (e) are given. According to the given series, you have to form a new series which begins with the given number, and then answer the question asked.

  1. 55.2511.536.75
    3(a)(b)(c)(d)(e)
    Which of the following numbers will come in place of (c) ?











  1. View Hint View Answer Discuss in Forum

    As per the details in the question the series is in the form of
    First series :-
    First term = 5
    Second term = First term × 1 + 0.25 × 1 = 5.25
    Third term = Second term × 2 + 0.25 × 4 = 11.5
    similarly , we can calculate the all next terms .
    Second series :-
    First term = 3
    Second term = First term × 1 + 0.25 × 1 = 3.25
    Third term = Second term × 2 + 0.25 × 4 = 7.5

    Correct Option: B

    As per the details in the question the series is in the form of
    First series :-
    First term = 5
    Second term = First term × 1 + 0.25 × 1
    Second term = 5 × 1 + 0.25 × 1 = 5.25
    Third term = Second term × 2 + 0.25 × 4
    Third term = 5.25 × 2 + 0.25 × 4 = 11.5
    similarly , we can find the all others terms .
    Second series :-
    First term = 3
    Second term = First term × 1 + 0.25 × 1
    Second term = 3 × 1 + 0.25 × 1 = 3.25
    Third term = Second term × 2 + 0.25 × 4 = 7.5
    Third term = 3.25 × 2 + 0.25 × 4 = 7.5
    Fourth term = Third term × 3 + 0.25 × 9
    Fourth term = 7.5 × 3 + 0.25 × 9 = 24.75
    So 24.75 should come in place of (c).


Direction: Which sequence of letters when placed at the blanks one after another will complete the given letter series?

  1. adb_ac_da_cddcb_dbc_cbda











  1. View Hint View Answer Discuss in Forum

    From above given series , we can see that
    The sequence order of above series is given as-
    adbcacbdabcddcbadbcacbda

    Correct Option: B

    From above given series , we can see that
    The sequence order of above series is given as-
    adbcacbdabcddcbadbcacbda
    Hence , required answer will be cbbaa .



  1. – aba – cabc – dcba – bab – a











  1. View Hint View Answer Discuss in Forum

    The given series is in the below pattern , we can see that
    The series formed is:
    a a b a b c a b c d d c b a c b a b a a in which the letters equi–distant from the beginning and end are the same.

    Correct Option: A

    The given series is in the below pattern , we can see that
    The series formed is:
    a a b a b c a b c d d c b a c b a b a a in which the letters equi–distant from the beginning and end are the same.
    Hence , required answer will be abdca .


  1. b — b — bb — bbb — bb — b











  1. View Hint View Answer Discuss in Forum

    The series is babb / bbab / bbba / bbbb.
    Thus, in each sequence, ‘a’ moves one step forward and ‘b’ takes its place and finally in the fourth sequence, it is eliminated.

    Correct Option: C

    The series is babb / bbab / bbba / bbbb.
    Thus, in each sequence, ‘a’ moves one step forward and ‘b’ takes its place and finally in the fourth sequence, it is eliminated.



  1. c _ bba _ cab _ ac _ ab _ ac











  1. View Hint View Answer Discuss in Forum

    The given series is in the below pattern , we can see that
    cabbac / cabbac / cabbac.

    Correct Option: B

    The given series is in the below pattern , we can see that
    cabbac / cabbac / cabbac.
    Hence , required answer will be acbcb .