sum:add 15 odd number
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Step-by-step explanation:
It is an AP : 1,3,5,7......
It is an AP : 1,3,5,7......a = 1 and d = 2 and n= 15
It is an AP : 1,3,5,7......a = 1 and d = 2 and n= 15Now, Sn = n/2 ( 2a + (n-1) d)
Sn = 15/2 ( 2+ 28)
= 15(1+14)
225
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