raju puts rs 5 coins in the square boxes . he puts 2 coins of rs 5 in 1st box, 4 in the 2nd box 6in 3rd box and so on . find the number coins put in9th box and find its value in terms of rupees raju puts rs 5 coins in the square boxes . he puts 2 coins of rs 5 in 1st box, 4 in the 2nd box 6in 3rd box and so on . find the number coins put in9th boox and find its valve in terms of rupees
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Answer:
a=2
d=2
a9=a+(n-1)d
a9=2+(9-1)2
=2+16
=18
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