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What is the value with a place of tenths in 907.456 1) 0 2) 6 3) 4 4) 5

8000 + 8800 + 8000 + 8 million + 80 trillion + another a katrillion equals

If the ratio of sum of the first m and n terms of an ap is m2 : n2 , show that the ratio of its mth and nth terms is (2m − 1) : (2n − 1).