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The natural numbers are written as follo...

The natural numbers are written as follows :

The sum of numbers in the nth row is :

A

a. `(n(n+1))/(2)`

B

b. `(n^2 +1)/(2)`

C

c. `(n(n^2 +1))/(2)`

D

d. none of these

Text Solution

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The correct Answer is:
C
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ARIHANT SSC-SEQUENCE, SERIES & PROGRESSIONS-EXERCISE LEVEL-2
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  2. The sum of n terms of the series 3/(1^2 * 2^2) + (5)/(2^2 * 3^2) + ...

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  3. The natural numbers are written as follows : The sum of numbers...

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  4. If a = underset(55 "times")underbrace(111.....1), b= 1+10+10^(2)+10^(3...

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  5. The interior angles of a polygon are in A.P. If the smallest angle is ...

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  6. If M is the mid point of the side BC of triangle ABC, and the area of ...

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  7. The value of 0.1bar(23) is :

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  8. A milk vendor has 21 lt of cow milk, 42 lt of toned milk and 63 lt of ...

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  9. One side of an equilateral triangle is 24 cm. The midpoints of its sid...

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  10. The odd positive integers are arranged in a traingle as follows : ...

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  11. Find the sum to n terms of the series log a+ log"" (a^3)/(b) + log ...

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  12. The value of 0. 2^(logsqrt(5)1/4+1/8+1/(16)+) is 4 b. log4 c. log2 d....

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  13. The ages of Samir and Tanuj are in the ratio of 8:15. After 9years the...

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  14. The radius of a circle is twice the side of a square, whose area is 19...

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  15. Find the sum of the series (5)/(13)+(55)/(13)^2+(555)/(13)^2+(5555)/((...

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  16. Sum of infinite series 1/(1*4)+1/(4*7)+1/(7*10)+......oo is

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  17. A sequence of real numbers a(1), a(2), a(3),......a(n+1) is such that ...

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  18. In a GP of real number , the sum of first four number is 30 and sum of...

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  19. A square is drawn by joining the mid points of the sides of a given sq...

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  20. An A.P. and a G.P. with positive terms have the same number of terms a...

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