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If the first term of an …

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If the first term of an A.P. is 5, the nth term is 40 and the sum of first n terms is 180, find the value of n.

    • Posted by Mohd Israiel Anis 1 year, 4 months ago

    CBSE > Class 10 > Mathematics
    • 2 answers

    Himanshu Dhakad 1 year, 4 months ago

    an=a+(n-1)d 40=5+(n-1)d 35=(n-1)d.......1 Sn=n/2(2a+(n-1)d) 180=n/2(2*5+(n-1)d) 360=n(10+(n-1)d) Using 1 equation 360=n(10+35) 360=n(45) n=360/45 n=8 Answer

    1Thank You

    Mohd Israiel Anis 1 year, 4 months ago

    Answer

    2Thank You

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