Plz solve S-12 question:4
And S-14 question:1
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HEY MATE HERE'S YOUR ANSWER
(FOR S-14)
LHS=S12
S12=12/2(2a+(12-1)d)
=6(2a+11d)
=12a+66d---------------(1)
RHS=3(S8-S4)
=3(8/2(2a+(8-1)d)-(4/2(2a+(4-1)d))
=3(4(2a+7d)-(2(2a+3d))
=3(8a+28d-4a-6d)
=3(4a+22d)
=12a+66d---------------(2)
HENCE PROVED
(FOR S-14)
LHS=S12
S12=12/2(2a+(12-1)d)
=6(2a+11d)
=12a+66d---------------(1)
RHS=3(S8-S4)
=3(8/2(2a+(8-1)d)-(4/2(2a+(4-1)d))
=3(4(2a+7d)-(2(2a+3d))
=3(8a+28d-4a-6d)
=3(4a+22d)
=12a+66d---------------(2)
HENCE PROVED
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