The sum of the first n terms of an arithmetic progresssio...
The sum of the first n terms of an arithmetic progresssion is 252. If the first term is -16 and the last term is 72, find the number of terms in the series
6
7
8
9
Correct answer is D
Sn=252,a=−16andl=72Sn=n2(−16+72)252=n2(−16+72)n=50456n=9
Two solid spheres have volumes 250cmo and 128cmo respectively. Find the ratio of their radii....
The length of a piece of stick is 1.75m. A girl measured it as 1.80m. Find the percentage error ...
Solve for x in 8x-2 = 2/25 ...
If y = 2x - sin2x, find dy/dx when x = π/4 ...
If s = (2 + 3t)(5t - 4), find ds/dt when t = 4/5 secs ...
Express the product of 0.0014 and 0.011 in standard form ...