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In a geometric progression, the 3rd term is 12 and the 6th term is 96. Find the sum of the first 8 terms.

A510

B765

C1020

DNone

উত্তর : B.

765

শেয়ার :

সম্পর্কিত প্রশ্ন সমূহ

১.

What is the minimum number of plants one should have so that they can be arranged in 12, 15 or 18 rowa and also be arranged in equal number of rows and columns?

A180

B900

C144

D225

২.

A litt serves floors 1 through 16, moving one floor every 12 seconds. It walts 48 seconds at both endpoints. It can complete how many round trips from 9.00 AM to 3: 20 AM?

A46

B48

C50

D52

৩.

What should be the ratio of sugar in a mixture costing BDT 50 per kg and BDT 55 per kg, such that there will be 10% profit if the mixture is sold for BDT 60 per kg?

ASat Dec 30 1899 10:11:00 GMT+0000 (Coordinated Universal Time)

BSat Dec 30 1899 10:01:00 GMT+0000 (Coordinated Universal Time)

CSat Dec 30 1899 01:10:00 GMT+0000 (Coordinated Universal Time)

DSat Dec 30 1899 06:05:00 GMT+0000 (Coordinated Universal Time)

৪.

In trangle ABC, the external bisectors of the angles B and C intersect at point O. If angle A is 90 degrees, then the measure of the angle BOC is...

A90°

B75°

C90°

D45°

৫.

Find the value of $\:\left(\sqrt{3}+1\right)\left(10+\sqrt{1}2\right)\left(\sqrt{1}2\:-\:2\right)\left(55-\sqrt{3}\right)$ .

A224

B148

C124

D176

৬.

A circle is inscribed in a right triangle whose legs measure 9 and 12. Find the radius of the circle.

C3.5

৭.

The present age of a father and his son are in ratio 7: 2. Five years ago the ratio was 6: 1. Find the sum of their present ages.

A45 years

B40 years

C35 years

D30 years

৮.

How many positive divisors of 7200 are perfect squares?

B10

C12

D15

৯.

For $x > 0$ , what is the minimum value of $x\:+\:\frac{16}{x}$ =?

C12

D16

১০.

A cistern is normally filled in 6 hours, but a leak makes it take 8 hours. How long would the leak alone take to empty a ful cistern?

A24 hours

B30 hours

C36 hours

D48 hours