Mathematics

The sum of the 1st and 2nd terms of an AP is 4 and the 10th term is 19. Find the sum of the 5th and 6th terms

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  1. a + a+d = 4
    a+9d = 19

    so, find a and d, and then you want

    a+4d + a+5d

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  2. 2a + d = 4
    a + 9d =19. .
    Solve simultaneously ,a=1 .,d =2. Find 2a + 9d =2 +18 =20

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  3. let 'a' is the first term of AP. 'd' is a common difference of AP.
    and the AP is : a,a+d,a+2d..........
    according to ques.
    a1+a2=4
    a+a+d=4......................................(1)
    a10=19
    a+9d=19......................................(2)
    after solving the equation 1 and 2 we get the value of 'a' and 'd' is 1 and 2 respectively.

    according to question we need to find the value of a5+a6=?

    a+4d+a+5d=2a+9d ..............(3)

    after puttig the value 'a' and 'd' in the 3 equation

    we get, 2a+9d = 20

    1. 👍
    2. 👎
  4. let 'a' is the first term of AP. 'd' is a common difference of AP.
    and the AP is : a,a+d,a+2d..........
    according to ques.
    a1+a2=4
    a+a+d=4......................................(1)
    a10=19
    a+9d=19......................................(2)
    after solving the equation 1 and 2 we get the value of 'a' and 'd' is 1 and 2 respectively.

    according to question we need to find the value of a5+a6=?

    a+4d+a+5d=2a+9d ..............(3)

    after puttig the value 'a' and 'd' in the 3 equation

    we get, 2a+9d = 20

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    2. 👎

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