If the Nth term of a series be 3+n(n-1), then the sum of n terms of the series is
If the Pth term of an A.P. be q and Qth term be p, then its
Six numbers are in A.P. such that their sum is 3. The first terms is 4 times the third term. Then the fifth term is
If the sum of first n natural numbers is 1/5 times the sum of
Let a1,a2,a3,........be terms of an A.P . If
If the first term of an A.P. be 10, last term is 50
If A1,A2, be two arithmetic means between 1/3 and 1/24 , then their values are
If a/b , b/c , c/a are in H.P. , then
If 1, log9 further equation is given below
Three number are in A.P. such that their sum is 18 and sum of thier squares is 158. The greatest number of them is
The arthmetic mean of first n natural numbers
If twice the 11th term of an A.P. is equal to 7 times of its 21st term, then its 25th term is equal to
The first to term of a geometric progression add up to 12, The sum of the third and the fourth terms is 48. If the terms of the ..
The mean of the series a , a+nd. A+2nd is
The product of n positive number is unity . Their sum is
The geometric of two numbers is 6 and their arithmetic means is 6.5 . The number are
If the A.M. is twice the G.M. of the number a and b , then a:b will be
The sum of n arithmetic means between a and b is
The first term of an A.P. is 2 and common difference is 4 . The sum of its 40 terms will be
The difference between two numbers is 48 and the difference between their arithmetic mean and their geometric mean is 18. Then the..
If the Pth, Qth and Rth term of an arithmetic sequence are a, b and c respectively
2+4+7+11+16+...to n terms=
If y=x-x^2+x^3-x^4+.....infinite, then value of x will be
If A1, A2,are the two A.M.s between two numbers a and b and G1, G2 be two G.M.s between same two numbers, then
If Sk denotes the sum of first k terms of an arithmetic progressive whose first term and common difference are a and d respectivel..
p^th term of the series (3-1/n)+(3-2/n)+(3-3/n)+.....will
If (a^n1+ b^n+1) / (a^n + b^n) be the A.M. of a and b, then n=
The sum of few terms of any ratio series is 728 , if common ratio is 3 and last term is 486, then first term of series will be
If a^,b^,c^ are in A.P., then which of the following is also in
A series whose Nth term is (n/x)+y, the sum of r terms will be
The harmonic mean between two numbers is 14 2/5 and the geometric mean 24 .The greater number between them is
If tan nÎ¦ = tan mÎ¦, then the different values of Î¦ will be in
The sum of first n natural numbers is
A boys goes to school from his home at a speed of x km/hour and comes back at a speed of y km/hour, then the average speed is give..
If the 7 ^ th term of a H.P. is 1/10 and the 12 ^th term is 1/25, then the 20^ th term is
If a1, a2,.....,an are in A.P. with common difference d
The solution of the equation (x+1)(x+4)(x+7)+....+(x+28)=155 is
If a,b,c are the positive integers, then (a+b)(b+c)(c+a) is
If Mth terms of the series 63+65+67+69+......and 3+10+17+24+......be equal, then m=
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