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Find the sum of first 51 …

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Find the sum of first 51 term of an ap whose second and third term are 14 and 18 respectively

Posted by Mohd Ismail 1 year, 3 months ago

CBSE > Class 10 > Mathematics

2 answers

Ameeshi Soni 1 year, 3 months ago

5610

Himanshu Dhakad 1 year, 3 months ago

Is question mein hame S51 ki value nikalni hai..toh agar hum S51 Ka formula likhe toh formula Hoga S51=51/2[2a+(51-1)d]........ab Hume iss formula mein "a" ki value chaiye or "d" ki value. Tabhi S51 ki value ayegi ...to "a" or "d" ki value hum nikalenge given 2nd or 3rd term s.........2nd term ko likh skte hai A2=a+d i.e 14=a+d----eq1 or sath mein A3=a+2d i.e 18=a+2d---eq2 ........ab 1 or 2 equation ko solve krne pe d=4 aayega then a=10 .....ab a or d ki values aa gyi hai toh simple S51 k formula mein put krdenge...answer aajayega..................hope it will help u;)

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