10. यदि गुणोत्तर श्रेढ़ी के लिए S2 = 3 और S4 = 15 है तो a और / का मान ज्ञात करें।
(If for G.P. S2=3 and S4 = 15, find the value of a and r.)
[Ans.a=1 and r=2
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