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[" 3."1+3+7+15+31+..." uptonterms equals...

[" 3."1+3+7+15+31+..." uptonterms equals "],[[" (a) "2^(n+1)-n," (b) "2^(" th ")-n-2]]

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1+3+7+15+31+...+ to n terms

1+3+7+15+31+...+ to n terms

1+3+7+15+31+......+ to n terms

3, 7, 13, 21, 31, ….

63, 31, 15, 7, 3, ?

3/(10) is equal to (a)3.1 (b) 1.3 (c) 0.3 (d) 0.03

x/3 + 1 = 7/15

1+3+7+15+31+..................... to n terms: