An organization plans to plant saplings in 25 streets in a town in such a way that one sapling for the first street, three for the second ,nine for the third and so on.how Many saplings are needed to complete the work ?
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19
Answer:
625
Step-by-step explanation:
n=25
a=1
a25=a+24d
a25=1+24*2
a25=49
s25=25/2(1+49)
=625
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