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The average of 13 results is 70. The average of first seven is 65 and that of the last seven is 75, the seventh result is:
Average of 13 results = 70
=> Sum of 13 results = $$13\times70=910$$
Similarly, sum of first seven = $$7\times65=455$$
And sum of last seven = $$7\times75=525$$
$$\therefore$$ Seventh result = $$(455+525)-910=70$$
=> Ans - (A)
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