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Sn=n/2×(2a+(n-1)d)
S7=7/2×(2a+6d)
49×2/7=2a+6d
14=2(a+3d)
a+3d=7 - 1
S17=17/2×(2a+16d)
289×2/17=2(a+8d)
17×2/2=a+8d
a+8d=17 - 2
subtracting 1&2
3d-8d=7-17
-5d=-10
d=-10/-5
d=2
substitute d=2 in 1
a+3×2=7
a=7-6
a=1
Sn=n/2×(2a+(n-1)d)
=n/2(2×1+2n-2)
=n/2×2n
=n^2
pls make it brainlist
I hope it will help you
S7=7/2×(2a+6d)
49×2/7=2a+6d
14=2(a+3d)
a+3d=7 - 1
S17=17/2×(2a+16d)
289×2/17=2(a+8d)
17×2/2=a+8d
a+8d=17 - 2
subtracting 1&2
3d-8d=7-17
-5d=-10
d=-10/-5
d=2
substitute d=2 in 1
a+3×2=7
a=7-6
a=1
Sn=n/2×(2a+(n-1)d)
=n/2(2×1+2n-2)
=n/2×2n
=n^2
pls make it brainlist
I hope it will help you
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