1.

find the sum of first 16terms of an ap whose 4th and 9th terms are minus 15 and minus 30 respectively​

Answer» S16=? A4 = -15. a+3d = -15 ____eq1a9 = -30. a + 8D = -30-------eq2 eq1/eq2 a+3d=-15 a + 8d = -30 ------------------ 5d = -15 -- d= -3--- ----------- a= -6


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