If a(1), a(2), a(3),........, a(n),... a...

If `a_(1), a_(2), a_(3),........, a_(n)`,... are in A.P. such that `a_(4) - a_(7) + a_(10) = m`, then the sum of first 13 terms of this A.P., is:

10 m

12 m

13 m

15 m

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