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Yogita Ingle 5 years, 9 months ago
Let first term be a = 1; and common ratio = d;
Then,
ad² + a d^{4} = 90
=> d4 + d² - 90 = 0
=> d4 + 10d² - 9d² - 90 = 0
=> (d² - 9) (d² + 10) = 0
=> d² = 9 {Neglecting -10}
=> d = ±3 Hence, the common ratio is ±3.....
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Yogita Ingle 5 years, 9 months ago
Number of students taking apple juice = n(A) =100
number of students taking orange juice = n(O) = 150
number of students taking both = n(A ∩O) =75
number of students taking either apple or orange juice = n(A∪O)
n(A∪O) = n(A)+n(O)-n(A∩O)
= 100+150-75
= 100+75
= 175
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Tushar Sindhu??? 5 years, 9 months ago
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