Question

25+28+ 31+...+100 का योगफल ज्ञात कीजिए।

Answer 1

Answer:

Step-by-step explanation:

a = 25 

d =28 - 25 = 3

an = 100

an = a+( n - 1) d

100 = 25 + (n-1) (3)

100 -25 = (n-1) (3)

75= (n-1) (3)

75/3 = (n-1) 

25 = (n-1) 

25 +1 = n 

26 = n

Sn = n/2 (a +an)

    =  26/ 2 ( 25 +100) 

      = 13 ( 125 )

     = 1625 

      

Answer 2

Answer:

a = 25 d =28 - 25 = 3 an = 100 = a+(n - 1) d an = 100 = 25 + (n-1) (3) 100 -25 = (n-1) (3) 75= (n-1) (3) 75/3 = (n-1) 25 = (n-1) 25 +1 = n 26 = n Sn = n/2 (a +an) 26/ 2 (25 +100) %3D = 13 ( 125 ) = 1625

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