Others Maths Puzzle Numerical Ability

Fill the blank
4,5,7,_,19

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Others Other Question

What is summition of ( k is to the powr 2 * 28Ck ) where value of k lies from 0 to 28
The cost of 1 goat is 25 paise.
The cost of 1 cow is 50 paise and the cost of 1 horse is 4 Rs. You have to buy 20 animals in 20 Rs only and atleast one animal should be there?