Solution
The given series is an arithmetic progression with first term $$a=9$$ and common difference $$d=-4$$
$$n^{th}$$ term in an A.P. = $$A_n=a+(n-1)d$$
=> $$A_{20}=9+(20-1)\times(-4)$$
= $$9+(19)(-4)$$
= $$9-76=-67$$
=> Ans - (D)
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