Calculate the sum: `2+(-2)+2+(-2)+2+(-2)+` (i)if the number of terms is 140 (ii)if the number of terms is 125

If sum of n terms of AP 2, 5, 8, .... is 155 then the number of terms is

The total number of terms in the expansion of (1+2x+x^2)^2 is

If the sum 1+2+2^2+......+2^(n-1) is 255, then find the number of terms.

The first and last term of a geometrical Pregression (G.P.) are 3 and 96 respectively. If the common ratio is 2, find : (i) 'n' the number of terms of the G.P. (ii) Sum of the n terms.

The sum of n terms of an A.P. is 3n^(2)+5 . The number of term which equals 159, is

The sum of n terms of an A.P. is 3n^(2)+5 . The number of term which equals 159, is

9. Find three numbers a,b,c between 2 & 18 such that; (G) their sum is 25 (ii) the numbers 2,a,b are consecutive terms of an AP & (ii) the numbers b,c, 18 are consecutive terms of a G.P.

Find three numbers a,b,c between 2 & 18 such that; (G) their sum is 25 (ii) the numbers 2,a,b are consecutive terms of an AP & (ii) the numbers b,c, 18 are consecutive terms of a G.P.

Find the numbers a,b,c between 2 and 18 such that (i) their sum is 25 (ii)the numbers 2,a,b are consecutive terms of an A.P and (iii) the numbers b,c 18 are respectively terms of a G.P