Tamil Nadu Board of Secondary EducationSSLC (English Medium) Class 10th
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Find the 19th term of an A.P. – 11, – 15, – 19, ... - Mathematics

Sum

Find the 19th term of an A.P. – 11, – 15, – 19, ...

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Solution

A.P = – 11, – 15, – 19, ...

a = – 11

d = t2 – t1 = – 15 – (– 11)

= – 15 + 11

= – 4

n = 19

∴ tn = a + (n – 1)d

t19 = – 11 + (19 – 1)(– 4)

= – 11 + 18 × – 4

= – 11 – 72

= – 83

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APPEARS IN

Samacheer Kalvi Mathematics Class 10 SSLC Tamil Nadu State Board
Chapter 2 Numbers and Sequences
Exercise 2.5 | Q 4 | Page 62
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