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CBSE Class 10 Answered

Find the number of terms in each of the following APs: (i) 7,13,19........,205 (ii) 18,15 1/2,13,.......,-47    
Asked by Prakash | 05 Aug, 2018, 10:14: AM
answered-by-expert Expert Answer
7,13,19........,205
Consider,
tn = 205
a + (n - 1) d = 205 where a = 7 and d = 13 - 7 = 6
7 + (n - 1) × 6 = 205
6(n - 1) = 198
n - 1 = 33
n = 34
Hence, the number of terms in the given sequence are 34.
Answered by Sneha shidid | 06 Aug, 2018, 10:11: AM

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