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What is the least number of terms of the...

What is the least number of terms of the G.P. 5+10 + 20 + …. Whose sum would surely exceed `10^6` ?

A

17

B

18

C

19

D

21

Text Solution

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The correct Answer is:
B
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ARIHANT SSC-SEQUENCE, SERIES & PROGRESSIONS-INTRODUCTORY EXERCISE 18.2
  1. The 5th , 8th and 11th terms of a G.P. are a,b,c respectively , then w...

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  2. The 5th and 12th terms of a G.P. are 32 and 4096 respectively . Find t...

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  3. What is the least number of terms of the G.P. 5+10 + 20 + …. Whose sum...

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  4. The A.M. of two positive numbers is 15 and their G.M is 12. What is th...

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  5. If the sum of three numbers in G.P. is 38 and their product is 1728, ...

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  6. The ratio of the sum of first three terms to the sum of first six term...

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  7. The sum of three numbers in G.P. is 14 . If the first two terms are ea...

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  8. The third term of G.P. is 4. The product of its first 5 terms is -

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  9. The sum of first three terms of a G.P. is 21 and sum of their squares ...

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  10. The sum of the first and the third term of G.P. is 15 and that of the ...

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  11. Sum of three consecutive terms in a G.P. is 42 their product is 512 . ...

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  12. The sum of three numbers in G.P. is 70, if the two extremes be multipl...

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  13. The sum of four terms in G.P. is 312 . The sum of first and fourth ter...

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  14. A bouncing tennis ball rebounds each time to a height equal to one hal...

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  15. Find the sum of n terms of the series" 7 + 77 + 777 + …

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  16. Find the sum of n terms of 0.8 + 0.88 + 0.888 + …

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  17. If the pth, qth and rth terms of a G.P. be respectively , a,b and c th...

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  18. If a,b,c are respectively the xth, yth and zth terms of a G.P. then th...

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  19. There are four numbers such that the first three of them form an Arith...

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  20. Find the sum of n terms of the series 1+3 +7 +15 + …

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