Question

the sum of first n term of three ap are S1 s2 and s3 the first term of each ap is 1,2,3 prove that s1 +s3 =2s2​

Answer 1

Answer:

Step-by-step explanation:

There is property that t1+t2=t3

T2+t4=t6

Answer 2

Step-by-step explanation:

let d be 1

then ap1=1,2,3,...

ap2=2,3,4,...

ap3=3,4,5,...

sn=n/2(a+l)

s1=n/2(1+3)=2n=6

s2=n/2(2+4)=3n=9

s3=n/2(3+5)=4n=12

s1+s3=2s2

6+12=2(9)

18=18

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hence proved...

hope helpful...