Fine 15th term of Ap 3.6.9. Using suitable formula
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a1 = 3, a2 = 6, a3 = 9, a15 = ?
d = a2 - a1
= 6 - 3
= 3
an = a + (n- 1) d
a15= 3 + (15-1) × 3
a15= 3 + 14 ×3
a15= 3 + 42
a15= 45
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