An important question from ML Agarwal of Class10 for board examination. Ramkali saved Rs 5 in the first week of a year and then increased her weekly saving by Rs 1.75. If in the n th week, her week, her weekly savings become Rs 20.75, find n.
ML Agarwal (avichal publication) Class 10, Arithmetic Progression, chapter 9, Question no. 26
Rajan@2021Guru
Ramkali saved Rs 5 in the first week of a year and then increased her weekly saving by Rs 1.75. If in the n th week, her week, her weekly savings become Rs 20.75, find n.
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Given that
a=5
d=1.75
an=20.75
an=a+(n−1)d
20.75=5+(n−1)1.75
15.75=(n−1)1.75