20 persons are to be awarded prizes so that every person get 2 rupees more than the previous person gets if the first person gets rupees 2 find the total amount spent on the prices.
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Answer:420
Step-by-step explanation:
it becomes a series with 1st perdon getting 2 rupees and nth person getting 2*n rupees with difference 2 like:
2+4+6+8+10+...........+40
so for sum prizes for 20 person can be calculated from sum of series to 20th term : (2*a+(n-1)*d)*(n/2) = (2 * 2 +(20-1)*2)*(20/2)
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