If a1,a2,a3,. . . ,an. . . are in A.P. s...

If `a_1,a_2,a_3,. . . ,a_n. . .` are in A.P. such that `a_4−a_7+a_10=m`, then sum of the first 13 terms of the A.P.is

A

10 m

B

12 m

C

13 m

D

15 m

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The correct Answer is:

C

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