Q.The number of terms which are free from radical in $(a + \sqrt{b})^{15} + (a - \sqrt{b})^{15}$ is

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Q.The number of terms which are free from radical in (a+b)15+(a−b)15(a + \sqrt{b})^{15} + (a - \sqrt{b})^{15}(a+b​)15+(a−b​)15 is