13, 17, 21,⋯ are in A.P. ⟹ 13×2,17×2, 21×2,⋯ are also in A.P.
True
It is given that 13, 17, 21,⋯ are in AP. Now by the property of AP's we know that when each term of an AP is multiplied by a constant number, then the resulting sequence is also in an AP.