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प्रश्न
The tenth term of H.P. `2/9, 1/7, 2/19, 1/12, ...` is:
विकल्प
`1/27`
`9/2`
`5/2`
27
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उत्तर
`bb(1/27)`
Explanation:
Sequence `2/9, 1/7, 2/19, 1/12,....` is in H.P.
`9/2, 7, 19/2, 12,...` is in A.P.
Where, `"a" = 9/2 and "d" = 7 - 9/2 = 5/2`
10th term in A.P. = a + (10 - 1)d
= `9/2 + 9 xx 5/2`
= 27
10th term in H.P. = `1/27`
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