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OTP to be sent to Change
b = a +D
c = a +2D
d = a+3D
e = a+ 4D
where D is the common difference of the AP.
now put these values in the quest.
a - 4(a+D) +6(a+2D) -4(a+3D) + a+ 4D
= 0 ANS.
Regards
Arun (askIITians forum expert)
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