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Arithmetic and Geometric Progressions — Mathematics STD 10 — Question

ICSE BoardEnglish MediumSTD 10MathematicsArithmetic and Geometric Progressions1 Mark
Question
Find the 8th term of the A.P. whose first term is $7$ and common difference is $3.$
✓

Answer

First term $(a) = 7$
and common difference $(d) = 3$
A.P. $= 7, 10, 13, 16, 19, …$
$T_8 = a + (n – 1)d$
$= 7 + (8 – 1) x 3$
$= 7 + 7 \times 3$
$= 7 + 21$
$= 28$

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