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CBSE Class 10 Answered

In AP a is equal to 8 tn is equal to 33 sn is equal to 123 and then find d and n
Asked by choudharymohit | 23 Jan, 2019, 20:59: PM
answered-by-expert Expert Answer
Given : first term a = 8
 
tn = 8+(n-1)d = 33 , or (n-1)d = 25
 
Sn = (n/2)[16+(n-1)d ] = (n/2)[16+25] = 123  
 
 hence n = 123×2/41  = 6   ;  (n-1)d = 5d = 25  or  d =5
Answered by Thiyagarajan K | 24 Jan, 2019, 14:27: PM

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