Que : Average of 5 consecutive even numbers is 12 . Find the sum of 1st and last numbers. Sol : shortcut... If consecutive numbers average is given, then average is (1st + last)/2 = 12 Therefore sum of 1st and last = 12*2 = 24
SURFACE AREA OF SPHERE:- If, the radius of a sphere=r Then, SURFACE AREA OF SPHERE=4πr2 Ex;- If, radius of a sphere=r=14cm SURFACE AREA OF SPHERE=4πr2 ...