Question 10 Find the 20th term in the following sequence whose nth term is an = n(n-2) / (n+3) ; a20
Class X1 - Maths -Sequences and Series Page 180
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360/23 at back side ans. is given wrong because in this type of questions we directly put the value.
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aₙ = n(n-2)/(n+3)
for finding 20th term put 9 in place of n and then calculate.
a₂₀ = 20( 20 -2)/(20 + 3)
= 20 × 18/23
= 360/23
for finding 20th term put 9 in place of n and then calculate.
a₂₀ = 20( 20 -2)/(20 + 3)
= 20 × 18/23
= 360/23
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