Find-a T n and T 15 for the A-P- 1-4-7-10- -b T 20 for the A-P- 8-2-4-10- -

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Ordering Integers

Find:a T n an...

Question

Find:

(a) T_n and T₁₅ for the A.P. 1, 4, 7, 10, …….

(b) T₂₀ for the A.P. 8, 2, −4, −10, …….

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Solution

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Similar questions

12, 19, 26

T_{n}

T_{15}

A. Find the A.P. in which (a) T_n = 2n + 1 (b) T_n = 4 − 5n (c) S_n = 5n² + 3n

B. (a) In an A.P. the fourth and seventh terms are 17 and 23 respectively, find ‘d’ and ‘a’.

(b) In and A.P. T₁₀ = 20 and T₂₀ = 10 find T₃₀

T_{20} - T_{10}

- 3, - 5, - 7, - 9, . . . . . . . . . . .

T_{25} - T_{20} = 15

∴

d =

\frac{1}{6}, \frac{1}{4}, \frac{1}{3}, . . . .

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