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a+3d=0
a=-3d
a+24d=-3d+24d=21d------------2
3times 11 term
3(a+10d)
3(-3d+10d)
3*7d
21d------. 1
1and2hence. proved
a=-3d
a+24d=-3d+24d=21d------------2
3times 11 term
3(a+10d)
3(-3d+10d)
3*7d
21d------. 1
1and2hence. proved
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