Find the sum to infinity:7/(4*1*2) + 10/(16*2*3) + 13/(64*3*4)+....

Unify the denominator by taking LCM and consequently form a common denomintor. In the numerator, form an expression for the ‘n^th’ term and proceed with the mehod as used for summing special series questions. The trick was to separate the numerator from the denominator in terms of n.