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NDA - Special series Test 974
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NDA - Special series Test 974
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  • Question 1/5
    1 / -0.33
    What will be the sum of n terms of the series
    Solutions

    Given

    ⇒

    ⇒

    ⇒

    ⇒

    Consider

    Clearly above series is a G.P. with common ratio 10 and first term 10

    Sum of n terms of G.P. =

    So

  • Question 2/5
    1 / -0.33
    Calculate the sum of the series .
    Solutions

    Given series

    We know  ………[i]

    Putting  and n=20 in equ[i] , we get

    Adding both the sides

  • Question 3/5
    1 / -0.33
    The sum of the series  is
    Solutions

    comparing given series with

    We get,  ........(i)

    And,  .......(ii)

    Dividing (ii) by the square of (i), we get

    Putting,  in eq (i), we get

    Put the value of  in , we get

     Sum of the series =

  • Question 4/5
    1 / -0.33
    The sum of the series:
    Solutions

    Let y=

    We know that

    Put x=1,

  • Question 5/5
    1 / -0.33
    Find the missing number of the series 6, 9, 18, ?, 135.
    Solutions

    first number is multiplied by 1.5 à 6*1.5=9.

    The latter numbers are multiplied by increasing 0.5 to the previous multiplier.

    6*1.5 =9

    9*2=18

    18*2.5=45

    45*3=135

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