a=10 and d=1. Find 25th term and sum of first 10 terms
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answer: 25th term is 34
sum of 10 terms is 145
Step-by-step explanation:
a = 10 , d = 1 , n = 25
Tn = a + (n - 1)d
T25 = 10 + ( 25 - 1) 1
= 10 + 24
= 34
and,for this n = 10
Sn = n/2 (2a + (n - 1) d
= 10/2 ( 2× 10 + ( 10-1)×1
= 5 × ( 20 + 9)
= 5× 29
= 145
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