Let a1, a2, a3 …an be in A.P. and Sn denotes the sum of first n terms of this A.P. If S10 = 390,

Let a₁, a₂, a₃ …an be in A.P. and S_n denotes the sum of first n terms of this A.P. If S₁₀ = 390, \(\frac{a_{10}}{a_{50}} = \frac{15}7\), then S₁₅- S₅ is equal to ______.

Let a1, a2, a3 …an be in A.P. and Sn denotes the sum of first n terms of this A.P. If S10 = 390,

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