The first term of an arithmetic progression (A.P) IS -8. THE RATIO OF THE 7TH TERM TO THE 9TH TERM IS 5:8.CALCULATE THE COMMON DIFFERENCE OF THE PROGRESSION
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Answer:
-3
Step-by-step explanation:
a7 = a+6d —(1)
a9 = a+8d —(2)
according to ques
a7:a9 = 5:8
a+6d / a+8d = 5/8 [from eqñ (1) and (2)]
8+6d / 8+8d = 5/8 (a= 8)
64 + 48d = 40 + 40d
64-40 = 40d-48d
24 = -8d
d = -3
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