Find the sum arithmetic progression 1/15,1/12,1/10,........up to 11 terms
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30/20
Step-by-step explanation:
The given AP is 1/15, 1/12, 1/10........ 11 terms
a = 1/15,
d = 1/12 - 1/15 = (5 - 4)/60
= 1/60
We know, sum of n terms
Sn = n/2[2a + (n-1)d]
Then, sum of 11 terms of given AP
S11 = 11/2[2*1/15 + 10*1/60]
= 11/2[2/15 + 10/60]
= 11/2[(8 + 10)/60]
= 11/2(18/60)
= 33/20
This is the answer .Hope it will be useful for you
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