1.

Sum of the 5th term and 24th term of an AP Is 50.when Find the sum of the 28th term??? ​

Answer»

Step-by-step EXPLANATION:

(a+4d)+(a+23d)=50

2A+27D=50

now,

s28=28/2{2a+(28-1)d}

s28=14{2(50-27d)+27d}

s28=14(50-27d+27d)

s28=14×50

s28=700



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