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Fill in the blanks in the following , gi...

Fill in the blanks in the following , given that a is the first term, d the common difference and `a_n` the nth term of the A.P.

Text Solution

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The correct Answer is:
a+(n-1)d
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Fill in the blanks in the following table , given that a is the first term, d the common difference and a_(n) the nth term of the A.P: (i) a=7, d=3, n=8, a_(n)=? (ii) a= - 18, n=10, a_(n)=0, d=? 0= -18+(10-1) d rArr 10d-d=18 9d=18 rArr d=(18)/(9)=2 d=2 (iii) a=? , d= -3, n=18, a_(n)= - 5 (iv) a= -18.9, d=2.5, n=?, a_(n)=3.6

Fill in the blanks in the following table, given that a is the first term, d the common difference and a_(n) n^(th) term of the AP :

Knowledge Check

  • In an AP, the seventh term is 4 and the common difference is -4. Which is the first term?

    A
    18
    B
    12
    C
    28
    D
    20

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