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In A.P. the first term is …

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In A.P. the first term is 2 and the sum of the first five term is one - fourth of the next five term . Show that 20th term is -112

    • Posted by Prince Mudgal 7 years, 2 months ago

    CBSE > Class 11 > Mathematics
    • 3 answers

    Suman Sharma 7 years, 2 months ago

    5/2(2a+4d)=5/8(2a+14d) 8a+16d=2a+14d 16+16d=4+14d 2d=-12 d=-6 A20=a+19d 2-114 -112

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    Shruti Gupta 7 years, 2 months ago

    ?? NCERT ques

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    Shivshant Upadhyay 7 years, 2 months ago

    (T1+T2+T3+T4+T5)=1/4(T6+T7+T8+T9+T10)=1/4[(T1+T2+T3+.....+T10)--(T6+T7+T8+T9+T10)] S5=1/4(S10--S5) 4S5=(S10--S5) 5S5=S10 5×5/2[2×2+(5-1)d]=10/2×[2×2+(10-1)d] 50(1+d)=(20+45d) 5d=-30 d=-6 T20=2+(20-1)×6=2+19×-6 =-112.

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