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ICSE Class 10 Answered

Find the number of terms: 5 2 -1 ......-49
Asked by bhavishgowdabs355 | 30 Apr, 2021, 09:03: AM
Expert Answer
The given terms are 5, 2, -1, ..., -49
This forms an A.P. with first term (a) = 5 and common difference (d) = -3
Let the number of terms be n.
So, -49 becomes the nth term.
an = -49
5 + (n - 1)(-3) = -49
5 - 3n + 3 = -49
8 - 3n = -49
3n = 57
n = 19
Hence, the number of term is 19.
Answered by Renu Varma | 05 May, 2021, 11:16: AM

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