a - b √15 = 2√3 + √5 / 2√3 - √5. Find the value of a and b.
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The real values of x for which y=1+
x
2
+
x
2
4
+
x
3
8
+
x
4
16
+......∞ is finite,is:
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The difference between the first and the fifth term of a geometric progression, whose all terms are positive numbers is 15 and the sum of the first and the third term of the progression is 20. Calculate the sum of the first five terms of the progression.
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