Simple interest is calculated only on the principal amount, or on that portion of the principal amount that remains. It excludes the effect of compounding....
Shortcut 99: nCr=n!/[r!(n-r)!] Question: In how many ways 2 shirts and 3 pants can be selected from 5 shirts and 7 pants? Answer: Selecting...
Shortcut 95: Repeated elements n!/(a!*b!) Question: In how many ways the letters of the word “ENVIRONMENT” can be arranged? Answer: n = 11 Let,...
Shortcut 91: Events Dependent=multiplication Independent =addition Question: There 3 busses from city A to city B and there are 5 busses from city...
Shortcut 87: Using the odd days Question: Find the day of birth of MS Dhoni (7 July, 1981), if 31 Dec 1999 is Friday...
Shortcut 85: Using tanƟ Ɵ tan 0 0 30 [latex]1/\sqrt3 [/latex] 45 1 60 [latex] \sqrt3[/latex] 90 ...
Shortcut 82: Maximum number of items per group Take HCF Question: There are 40, 45 and 50 balls in three different colors. They have...
Shortcut 77: Divisibility test Divisibleby Rule 2 Last digit of a number should be 0,2,4,6, or 8 3 Sum of the digit should be divisible...
Shortcut 75: Simple interest [latex]SI=\frac{PNR}{100}[/latex] P = Principle amount invested or borrowed R = Rate of interest per term N = Number of terms Term...
Shortcut 73: One pipe fills and another empties [latex]\frac{AB}{-A+B}[/latex] Question: Pipe A can fill a tank in 4 hours and pipe B can empty the...
