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We know that for findind the value of p we have to find a and d
for a=p-1(given)
so , 2p-(p-1)
2p-p+1, p+1
so d=p+1
for finding p
p-1+p+1, 2p+0, p=-2
for proving it
put value of p
in a=p-1
2)2p= 2.(-2)=-4
so for check it
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