Amit saves certain amount every month in a specific way. In the first month he saves 200RS,in the third month 300Rs ;and so on .how much will be his total savings in 17 months?
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Step-by-step explanation:
Here , a = ₹ 200
t2 = ₹ 300
d = ₹ 100
Sn = n [ 2a + ( n - 1 ) d ]
2
S17 = 17 [ 2 ( 200 ) + ( n - 1 ) 100 ]
2
= 17 [ 400 + 1600 ]
2
= 17 × 20000
2
= ₹ 170000
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