plz do 24. one for me ..it's confusing
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sum of 3 middle terms =225
a18th+a19th+a20th=225
a+17d+a+18d+a+19d=225
3a+54d=225
3a=225-54d
a=(225-54d)/3
a=225/3-54d/3
a=75-18d
a35th+a36th+a37th=429
a+34d+a+35d+a+36d=429
3a+105d=429
3(75-18d)+105d=429
225-54d+105d=429
105d-54d=429-225
51d=204
d=204/51
d=4
a=75-18d
a=75-18×4
a=75-72
a=3
a1st=a=3
a2nd=a+d=3+4=7
a3rd=a+2d=3+2×4=3+8=11
a18th+a19th+a20th=225
a+17d+a+18d+a+19d=225
3a+54d=225
3a=225-54d
a=(225-54d)/3
a=225/3-54d/3
a=75-18d
a35th+a36th+a37th=429
a+34d+a+35d+a+36d=429
3a+105d=429
3(75-18d)+105d=429
225-54d+105d=429
105d-54d=429-225
51d=204
d=204/51
d=4
a=75-18d
a=75-18×4
a=75-72
a=3
a1st=a=3
a2nd=a+d=3+4=7
a3rd=a+2d=3+2×4=3+8=11
5253:
mark it as brainiest plz
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