Question

A student saves 5 Rs in first week, 10 Rs in second week, is Rs in third week
his pocket money. If he continues in this order what is the total amount at the end of
weeks.​

Answer 1

Rs 600

Step-by-step explanation:

the problem is based on Arithmetic Progression

given: a = 5, d = 5

to find total amount at the end of 15 weeks

formula used : Sn = n/2 [ 2a + (n-1) d ]

S15 = 15/2 [ 2*5 + 14*5 ]

S15 = 15/2 [10 + 70]

S15 = 15/2 * 80

S15 = Rs 600

Answer 2

Answer:

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