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Ramkali saved Rs 5 in the first week of a year and then increased her weekly savings by Rs 1.75. If in the nth week, her weekly savings become Rs 20.75, find n.

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+1 vote
by (29.2k points)
Best answer

Given , a = 5, = 1.75, a= 20.75, n = ?

In A.P. nth term is given by

an = a + (n − 1) d

n − 1 = 9

n = 10

Hence, n is 10.

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