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Hich term of the progression 2, 8, 32, ... is 131072? - Mathematics

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प्रश्न

Which term of the progression 2, 8, 32, ... is 131072?

योग
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उत्तर

a = 2

r = `8/2`

r = 4

`a_n = ar^(n - 1)`

131072 = `2 (4)^(n - 1)`

`(4)^(n - 1) = 131072/2`

`(4)^(n - 1) = 65536`

`(4)^(n - 1) = 4^8`

n − 1 = 8

n = 8 + 1

n = 9

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  क्या इस प्रश्न या उत्तर में कोई त्रुटि है?
अध्याय 9: Arithmetic and geometric progression - Exercise 9D [पृष्ठ १९४]

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नूतन Mathematics [English] Class 10 ICSE
अध्याय 9 Arithmetic and geometric progression
Exercise 9D | Q 10. | पृष्ठ १९४
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