Find the sum of arithmetic sequence which contains 25 terms and whose

1.	Find the sum of arithmetic sequence which contains 25 terms and whose middle term is 20
Answer» *SOLUTION ☺️* 25 *terms* *which* is *odd* *terms* so, *the* *middle term* = (n+1)/2th *term* =) 25+1/2 =) 26/2 =) 13th *term* A/q =) 13th *term= 20term =) a+12d= 20..........(1) Sum* of *the* *series= n/2[2a+(n-1)d] =) 25/2[2a+(25-1)d] =) 25/2×2[a+12d] =) 25[a+12d] =) 25(20)......(using* *EQUATION* 1) =) 25×20 =) 500 *HOPE it* *HELPS* ✔️

Find the sum of arithmetic sequence which contains 25 terms and whose middle term is 20

Answer»

SOLUTION ☺️

25 terms which is odd terms

so, the middle term = (n+1)/2th term

=) 25+1/2

=) 26/2

=) 13th term

A/q

=) 13th term= 20term

=) a+12d= 20..........(1)

Sum of the series= n/2[2a+(n-1)d]

=) 25/2[2a+(25-1)d]

=) 25/2×2[a+12d]

=) 25[a+12d]

=) 25(20)......(using EQUATION 1)

=) 25×20

=) 500

HOPE it HELPS ✔️

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Find the sum of arithmetic sequence which contains 25 terms and whose middle term is 20​

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Find the sum of arithmetic sequence which contains 25 terms and whose middle term is 20