10th Class Mathematics Solved Paper - Mathematics-2018

  • question_answer In an AP, if the common difference \[(d)=-4\] and the seventh term \[\left( {{a}_{7}} \right)\] is 4, then find the first term.

    Answer:

    Given,
                           \[d=-4\]
                          \[{{a}_{7}}=4\]
                     \[a+6d=4\]
                  \[a+6(-4)=4\]
                      \[a-24=4\]
                            \[a=4+24\]
                            \[a=28\]


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