Math, asked by ayushbisht02pdbsmj, 1 year ago

किसी समान्तर सरेड़ी के 7 पदों का योग 10 है, और उसके अगले 7 पदों का योग 17 है ; श्रेणी ज्ञात कीजिये ।

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rakeshmohata: is the answer 1, 8/7, 9/7 ,10/7

Answers

Answered by Swarnimkumar22
20
Hay dear user

it's ur answer

T7 = a + 6d

10 = a + 6d ........(1)

T14 = a + 16d

17 = a + 16d....... (2)


समीकरण 1 वा 2 से -

10 = a + 6d
17 = a + 16d
___________
7 = 10 d

=> d = 7/10

d का मान समीकरण एक में रखने पर

10 = a +16 × 7/10

10 = a +56/5

a = 10+56/5

a =  \frac{10}{1}  +  \frac{56}{5}  \\ a =  \frac{50 + 56}{5}  \\  \\ a =  \frac{106}{5}


तब श्रेणी T1 = 106/5,

T2 = a +2d

 \frac{106}{5}  + 2 \times  \frac{7}{5}  \\  \frac{106}{5}  +  \frac{14}{5}  =  \frac{120}{5}  = 24

T3 = a + 3d

 \frac{106}{5}  +  \frac{21}{5}  =  \frac{127}{5}

106/5,24,127/5...........Tn


I hope it's help you


Regards : @Swarnimkumar21###

ayushbisht02pdbsmj: sry but this is a wrong answer
Swarnimkumar22: then what's right answer
Swarnimkumar22: say fast I have not enough time
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