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A series

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7, 63, 215, 513, 999

Carefully observe the pattern of series and tell

a) Which no. is incorrect in the above series?

b) What will be the correct no in that place?

c) What will be the next two numbers in the above series?

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Each number is (2*n)^3 -1.

(A) 513 is incorrect.

(B) 511 should be in its place.

© 1727 and 2743.

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