Find the sum of last ten terms of the ap -5,-7,-9........-51.
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-5,-7,-9,-11,-13,-15,-17,-19,-21,-23,-25,-27,-29-31,-33,-35,-37,-39,-41,-43,-45,-47,-49,-51
sum sum of last 10 digest
-33,-35,-37,-39,-41,-43,-45,-47,-49,-51=420
answer=420
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