Question

the mid term of an arithmetic series consisting of 25 term is 20 find the sum of series​

Answer 1

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Answer 2

Answer:

since there are 25 terms which is odd the middle term is(25+1)/2th term that is 13th term

13th term = 20

a+12d=20

sum of nth term=n/2{2a+(n-1)d}

=25/2{2a+(25-1)d}

=25/2{2a+24d}

taking 2 as common

=25/2{2(a+12d)}

=25(a+12d)

from 1,a+12d=20

25multiply20 =500

500 is ans