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11th Class Mathematics Sequence and Series Question Bank Sequence and Series (A.P., G.P. and H.P.)

  • question_answer
    A number of bricks are arranged in a compete pyramid on a square base of side 13 cm. when each brick is a cube of 1 cm, then total number of bricks used, is given by

    A)  1027                           

    B)  819        

    C)  313                

    D)  727

    Correct Answer: B

    Solution :

    (b): The relation to be used here, is given by\[S=\text{ }{{n}^{2}}+{{\left( n-1 \right)}^{2}}+{{\left( n-2 \right)}^{2}}+-----+1\] (where n = 13).     


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